docs: add contributing guidelines to the project

Author: pedroab0

CONTRIBUTING.md

@@ -0,0 +1,29 @@
+# Contributing to swr-catalyst
+
+First off, thank you for considering contributing! It's people like you that make open source such a great community.
+
+## Getting Started
+
+1.  **Fork the repository** and clone it to your local machine.
+2.  **Install dependencies:**
+    ```bash
+    npm install
+    ```
+3.  **Run the tests** to make sure everything is set up correctly:
+    ```bash
+    npm test
+    ```
+
+## Making Changes
+
+1.  Create a new branch for your feature or bug fix.
+2.  Make your changes. Please make sure to add or update tests as appropriate.
+3.  Ensure all tests pass before submitting your change.
+
+## Submitting a Pull Request
+
+1.  Push your changes to your fork.
+2.  Open a pull request to the `main` branch of the original repository.
+3.  Provide a clear description of the problem and solution in your pull request. Include the relevant issue number if applicable.
+
+Thank you for your contribution!