add contribution.md

.env.example

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+# Copy this file to .env and set the variables
+# The variables are only used when running locally
+
+# REQUIRED: Set this as your Github personal access token
+GITHUB_TOKEN=
+
+# REQUIRED: LLM API
+LLM_API_KEY= # API key from your LLM provider (ie Anthropic, Google, OpenAI)
+LLM_MODEL= # Model name from your LLM provider (ie claude-3-5-sonnet-20241022, gemini-1.5-flash-latest, gpt-4o-mini)
+
+# Simulate a Pull Request open event
+GITHUB_ACTION=ai-reviewer
+GITHUB_EVENT_NAME=pull_request
+GITHUB_EVENT_ACTION=created
+GITHUB_REPOSITORY=presubmit/ai-reviewer # update with your fork
+GITHUB_PULL_REQUEST=1 # update with your pull request number
+GITHUB_COMMENT_ID=1111111 # update with your comment id
+
+# Simulate a Pull Request review comment event
+# GITHUB_ACTION=ai-reviewer
+# GITHUB_EVENT_NAME=pull_request_review_comment
+# GITHUB_EVENT_ACTION=created
+# GITHUB_REPOSITORY=presubmit/ai-reviewer # update with your fork
+# GITHUB_PULL_REQUEST=1 # update with your pull request number
+# GITHUB_COMMENT_ID=1111111 # update with your comment id

CONTRIBUTING.md

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+# Contributing to AI PR Reviewer
+
+Thank you for your interest in contributing to AI PR Reviewer! This document provides guidelines and instructions for contributing to the project.
+
+## Getting Started
+
+1. Fork the repository
+2. Clone your fork locally
+3. Install dependencies with `pnpm install`
+4. Create a new branch for your feature/fix: `git checkout -b feature-name`
+
+## Development Setup
+
+### Prerequisites
+
+- Node.js (LTS version recommended) + Typescript
+- [Github personal access token](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens)
+- LLM API key from OpenAI, Anthropic or GoogleAI
+- (recommended) pnpm package manager
+
+## Development Workflow
+
+1. Make your changes in a feature branch
+2. Commit your changes using conventional commits:
+   - `feat: add new feature`
+   - `fix: resolve bug`
+   - `docs: update documentation`
+   - `test: add tests`
+   - `refactor: improve code structure`
+3. Open Pull Request against main repo
+
+## Testing
+
+1. Copy the `.env.example` file to `.env`:
+
+   ```bash
+   cp .env.example .env
+   ```
+
+2. Configure your environment variables in `.env`:
+
+   ```env
+   # Required: Choose your AI provider
+   AI_PROVIDER=anthropic # or openai
+
+   # Required: Set your API key and model based on the chosen provider
+   LLM_API_KEY=...
+   LLM_MODEL=...
+
+   # Required: Github personal access token
+   GITHUB_TOKEN=...
+   ```
+
+   And uncomment one of the events that you want to test: `pull_request` or `pull_request_review_comment`
+
+3. Run `pnpm dev` to test the updated reviewer in the Pull Request specied in .env
+
+## Pull Request Process
+
+1. Update the README.md with details of significant changes if applicable
+2. Ensure your PR description clearly describes the problem and solution
+3. Link any related issues using GitHub keywords (e.g., "Fixes #123")
+4. Make sure all checks pass on your PR
+5. Request review from maintainers
+
+## Questions or Need Help?
+
+- Open an issue for questions
+- Join our community discussions
+- Reach out on [X/Twitter](https://x.com/bdstanga)
+
+## License
+
+By contributing to AI PR Reviewer, you agree that your contributions will be licensed under the same license as the project.
+
+Thank you for contributing to make AI PR Reviewer better! 🚀