Add `shortest init` command for simplified setup

[rmarescu]

What

Introduce a shortest init command to streamline the process of setting up Shortest in a new or existing project. This command will:

• Install Dependencies:

  • Automatically install the @antiwork/shortest package as a dev dependency if it is not already installed.

• Generate Configuration Files:

  • Create a default shortest.config.ts file with boilerplate configuration.
  • Add .shortest/ to .gitignore if not already present.

• Create Environment Files:

  • Generate a .env.local file with placeholders for required environment variables such as:
    • ANTHROPIC_API_KEY
  • Add it to .gitignore

• Provide Meaningful Feedback:

  • Output details of the installation and configuration process, such as installed dependencies, created files, and next steps for users.

• Seamless Integration with npx:

  • Allow the shortest init command to work even when invoked through npx @antiwork/shortest init, enabling a zero-install setup experience.

• Updade README

Why

• Streamline onboarding for new users, making it easy to start using the framework without manual setup.
• Reduce errors caused by missing dependencies, misconfigured environments, or skipped steps.
• Encourage adoption by lowering the barrier to entry for first-time users.
• Provide consistency across projects by generating standardized configuration and environment files.

Example

npx shortest init

Expected output:

Installing @antiwork/shortest...
Setting up Shortest...

✔ Dependencies installed
✔ shortest.config.ts created
✔ .env.local created/updated
✔ .gitignore created/updated

Initialization complete. Add your API key to `.env.local` and start testing!