docs: add contributing guidelines (#117)

CONTRIBUTING.md

@@ -0,0 +1,23 @@
+# Contributing to Fusion
+
+Thank you for investing your time in contributing to our project!
+
+Before you start contributing, please take a moment to read through these guidelines. They will help you understand how to contribute effectively and make the process smoother for everyone involved.
+
+## Issues
+
+- Please search for existing issues before creating a new one. If you find an existing issue that matches your concern, please add your comments there instead of creating a new issue.
+- If you are reporting a bug, please provide as much detail as possible, including steps to reproduce the issue, expected behavior, and actual behavior. Screenshots or logs are very helpful.
+- If you are suggesting a new feature or improvement, please explain the use case and how it would benefit the project. A clear description helps us understand your perspective better.
+- If you are unsure whether your issue is a bug or a feature request, feel free to ask in the issue comments. We are here to help!
+
+## Pull requests
+
+- Please ensure your PR is clear and concise. One PR should ideally address one issue or feature request at a time.
+- A good PR description should include:
+  - A brief summary of the changes you made.
+  - The reason for these changes and any relevant context.
+  - Any related issues or discussions (link to them if possible).
+- Make sure your code follows the project's coding style and conventions. You can run the linter and formatter to check for any issues before submitting your PR.
+- Set the status to Draft if your PR is still a work in progress. This helps us understand that you are not yet ready for a review.
+- AI coding is cool, but please carefully review the code before submitting a PR, rather than just relying on 'vibe coding'.

README.md

@@ -61,7 +61,7 @@ Maintained by community:
 
 ### Build from source
 
-Check out the Development section.
+Check out the "Contributing" section.
 
 ## Configuration
 
@@ -72,7 +72,9 @@ Fusion can be configured in many ways:
 - System environment variables, such as those set by `export PASSWORD=123abc`.
 - Create a `.env` file in the same directory as the binary. Note that values in `.env` file can be overwritten by system environment variables.
 
-## Development
+## Contributing
+
+Contributions are welcome! Before contributing, please read the [Contributing Guidelines](./CONTRIBUTING.md).
 
 - Prepare environment: Go 1.24+, Node.js 23+ (and pnpm).
 - Check out the commands in `scripts.sh`.