chore: add contributing guide

Author: rohan-chaturvedi

CONTRIBUTING.md

@@ -0,0 +1,87 @@
+# Contributing Guide
+
+Thank you for your interest in contributing to the Phase Node.js SDK! We welcome all contributions, whether it's fixing bugs, adding new features, or improving documentation.
+
+## Getting Started
+
+1. **Fork the repository** on GitHub.
+2. **Clone your fork** to your local machine:
+   ```sh
+   git clone https://github.com/your-username/node-sdk.git
+   cd node-sdk
+   ```
+3. **Install dependencies**:
+   ```sh
+   yarn install
+   ```
+4. **Build the package**:
+   ```sh
+   yarn build
+   ```
+5. **Run tests**:
+   ```sh
+   yarn test
+   ```
+
+## Making Changes
+
+- Follow the existing code style (Prettier and ESLint are configured).
+- Write clear commit messages following the [Conventional Commits](https://www.conventionalcommits.org/) format.
+- Ensure all tests pass before submitting a pull request.
+- If adding a new feature, consider writing tests to cover your changes.
+- Consider if your changes require an update to [docs](https://github.com/phasehq/docs).
+- Bump the package version in `package.json` and `version.ts`. Use the semver standard to bump the major, minor or patch version depending on the type of change you're making.
+
+## Setting Up a Test Project
+
+To test your local changes in a real project, follow these steps:
+
+1. **Create a new test project:**
+   ```sh
+   mkdir test-project && cd test-project
+   yarn init -y
+   ```
+
+2. **Link the local SDK package:**
+    In the SDK root, run:
+   ```sh
+   yarn link
+   ```
+   Then in your test project, 
+   ```sh
+   yarn link '@phase.dev/phase-node'
+   ```
+
+
+3. **Use the SDK in your test project:**
+   ```js
+   const Phase = require('@phase.dev/phase-node')
+   ```
+
+## Submitting a Pull Request
+
+1. **Create a new branch:**
+   ```sh
+   git checkout -b feature/your-feature
+   ```
+2. **Make and commit your changes:**
+   ```sh
+   git commit -m "feat: add new feature"
+   ```
+3. **Push to your fork:**
+   ```sh
+   git push origin feature/your-feature
+   ```
+4. **Open a Pull Request** on GitHub against the `main` branch.
+
+## Useful Links
+
+[Phase Quickstart](https://docs.phase.dev/quickstart)
+
+[SDK Docs](https://docs.phase.dev/sdks/node)
+
+[Docs repo](https://github.com/phasehq/docs)
+
+[Community Slack](https://slack.phase.dev)
+
+