docs: add basic contributing guide

Author: Mahi-korrapati

docs/CONTRIBUTING.md

@@ -0,0 +1,30 @@
+# Contributing to quick-lint-js
+
+Thank you for your interest in contributing to quick-lint-js!
+
+## How to contribute
+
+### 1. Fork the repository
+Create your own fork of the project on GitHub and clone it locally.
+
+### 2. Create a new branch
+Use a descriptive branch name for your change:git checkout -b docs/update-contributing
+
+
+### 3. Make your changes
+For documentation updates, you can edit files inside the `docs/` directory or `README.md`.
+
+### 4. Run tests (optional)
+If you modify source code, run tests:
+
+### 5. Commit your changes
+
+### 6. Push the branch
+
+### 7. Open a Pull Request
+Go to your fork on GitHub and open a PR to the main repository.
+
+---
+
+If you have questions, feel free to open an issue or ask the maintainers. Thank you for helping improve quick-lint-js!
+