docs: add guide

Author: jungeun-cho

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of experience,
+education, socio-economic status, nationality, personal appearance, race,
+religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at [email protected]. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org

CONTRIBUTING.md

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+# Contributing to TOAST UI
+
+First off, thanks for taking the time to contribute! 🎉 😘 ✨
+
+The following is a set of guidelines for contributing to TOAST UI. These are mostly guidelines, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request.
+
+## Reporting Bugs
+Bugs are tracked as GitHub issues. Search the list and try to reproduce on [demo](https://nhn.github.io/tui.calendar/latest/tutorial-example00-basic) before you create an issue. When you create an issue, please provide the following information by filling in the template.
+
+Explain the problem and include additional details to help maintainers reproduce the problem:
+
+* **Use a clear and descriptive title** for the issue to identify the problem.
+* **Describe the exact steps which reproduce the problem** in as many details as possible. Don't just say what you did, but explain how you did it. For example, if you moved the cursor to the end of a line, explain if you used a mouse or a keyboard.
+* **Provide specific examples to demonstrate the steps.** Include links to files or GitHub projects, or copy/pasteable snippets, which you use in those examples. If you're providing snippets on the issue, use Markdown code blocks.
+* **Describe the behavior you observed after following the steps** and point out what exactly is the problem with that behavior.
+* **Explain which behavior you expected to see instead and why.**
+* **Include screenshots and animated GIFs** which show you following the described steps and clearly demonstrate the problem.
+
+## Suggesting Enhancements
+In case you want to suggest for TOAST UI Calendar, please follow this guideline to help maintainers and the community understand your suggestion.
+Before creating suggestions, please check [issue list](https://github.com/nhn/tui.calendar/labels/Type:%20Enhancement) if there's already a request.
+
+Create an issue and provide the following information:
+
+* **Use a clear and descriptive title** for the issue to identify the suggestion.
+* **Provide a step-by-step description of the suggested enhancement** in as many details as possible.
+* **Provide specific examples to demonstrate the steps.** Include copy/pasteable snippets which you use in those examples, as Markdown code blocks.
+* **Include screenshots and animated GIFs** which helps demonstrate the steps or point out the part of TOAST UI Calendar which the suggestion is related to.
+* **Explain why this enhancement would be useful** to most TOAST UI users.
+* **List some other applications where this enhancement exists.**
+
+## First Code Contribution
+
+Unsure where to begin contributing to TOAST UI? You can start by looking through these `document`, `good first issue` and `help wanted` issues:
+
+* **document issues**: issues which should be reviewed or improved.
+* **good first issues**: issues which should only require a few lines of code, and a test or two.
+* **help wanted issues**: issues which should be a bit more involved than beginner issues.
+
+## Pull Requests
+
+### Development WorkFlow
+- Set up your development environment
+- Make change from a right branch
+- Be sure the code passes `npm run eslint`, `npm run test`
+- Make a pull request
+
+### Development environment
+- Prepare your machine node and it's packages installed.
+- Checkout our repository
+- Install dependencies by `npm install`
+- Start webpack-dev-server by `npm run serve`
+
+### Make changes
+#### Checkout a branch
+* **master**: PR base branch. merge features, updates for next minor or major release.
+lastest release branch with distribution files.
+- **gh-pages**: API docs, examples and demo
+
+#### Check Code Style
+Run `npm run eslint` and make sure all the tests pass.
+
+#### Test
+Run `npm run test` and verify all the tests pass.
+If you are adding new commands or features, they must include tests.
+If you are changing functionality, update the tests if you need to.
+
+#### Commit
+Follow our [commit message conventions](./docs/COMMIT_MESSAGE_CONVENTION.md).
+
+### Yes! Pull request
+Make your pull request, then describe your changes.
+#### Title
+Follow other PR title format on below.
+```
+    <Type>: Short Description (fix #111)
+    <Type>: Short Description (fix #123, #111, #122)
+    <Type>: Short Description (ref #111)
+```
+* capitalize first letter of Type
+* use present tense: 'change' not 'changed' or 'changes'
+
+#### Description
+If it has related to issues, add links to the issues(like `#123`) in the description.
+Fill in the [Pull Request Template](./docs/PULL_REQUEST_TEMPLATE.md) by check your case.
+
+## Code of Conduct
+This project and everyone participating in it is governed by the [Code of Conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code. Please report unacceptable behavior to [email protected].
+
+> This Guide is base on [atom contributing guide](https://github.com/atom/atom/blob/master/CONTRIBUTING.md), [CocoaPods](http://guides.cocoapods.org/contributing/contribute-to-cocoapods.html) and [ESLint](http://eslint.org/docs/developer-guide/contributing/pull-requests)
+
+[demo]:https://nhn.github.io/tui.calendar/

LICENSE

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+
+MIT License
+
+Copyright (c) 2021 NHN Corp.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.