Update issue templates

Author: javiber

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+_A clear and concise description of what the bug is._
+
+**To Reproduce**
+_Steps to reproduce the behavior._
+
+**Expected behavior**
+_A clear and concise description of what you expected to happen._
+
+**Screenshots or videos**
+_If applicable, add screenshots or videos to help explain your problem._
+
+**Environment (please complete the following information):**
+ - OS: [e.g. Ubuntu 20.04]
+ - Python version: [e.g. 3.9.10]
+ - Norfair version: [e.g. 1.0.0]
+
+**Additional context**
+_Add any other context about the problem here._

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: feature request
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+_A clear and concise description of what the problem is._
+
+**Describe the solution you'd like**
+_A clear and concise description of what you want to happen._
+
+**Describe alternatives you've considered**
+_A clear and concise description of any alternative solutions or features you've considered._
+
+**Additional context**
+_Add any other context or screenshots about the feature request here._

.github/ISSUE_TEMPLATE/help_wanted.md

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+---
+name: Help wanted
+about: Ask for help in the use of the library
+title: ''
+labels: help wanted
+assignees: ''
+
+---
+
+**Describe the situation you are working on**
+_A clear and concise description of your use case._
+
+**Describe what is it that you need help with**
+_A clear and concise description of what you don't understand or need help with._
+
+**Additional context**
+_Add any other context about the problem here._