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CONTRIBUTING.md

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+# Contributing Guidelines
+
+Thank you for your interest in contributing to MOS3. This is a Contribution guidelines.  
+Please read through this document before submitting any issues or pull requests.
+
+## Contributing via Pull Requests
+
+To send us a pull request, please:
+
+1. Fork the repository.
+2. Modify the source code.
+3. Ensure local tests pass.
+4. Commit to your fork.
+5. Send us a pull request.
+
+## Set up your local development environment
+To set up MOS3 in your local environment, please:
+
+1. Fork this repository, and clone source code using `git clone`
+2. go to mos3 directory using `cd mos3`
+3. Run the follwing command `go run main.go`
+4. Then access http://localhost:3333/s3
+
+## Licensing
+
+See the [LICENSE](LICENSE) file for our project's licensing. We will ask you to confirm the licensing of your contribution.