Add CONTRIBUTING.md and update README to include contribution guidelines

Author: ceelsoin

CONTRIBUTING.md

@@ -0,0 +1,53 @@
+# Contributing to go-qs
+
+Thank you for your interest in contributing to **go-qs**! We welcome pull requests and issues to help improve this library.
+
+## How to Contribute
+
+### Pull Requests
+- Fork the repository and create your branch from `main`.
+- Write clear, concise commit messages.
+- Add tests for new features or bug fixes.
+- Ensure your code passes all tests (`go test`).
+- Document your changes in the README if needed.
+- Reference related issues in your PR description.
+- Example: If you add support for a new query format, include a sample query and expected output.
+- If your change is inspired by or compared to the JavaScript `qs` library, mention the relevant behavior and differences.
+
+### Issues
+- Search for existing issues before opening a new one.
+- When reporting a bug, include:
+  - Example query string
+  - Expected output (in Go and, if possible, in JavaScript `qs`)
+  - Actual output
+  - Environment details (Go version, OS, etc.)
+- For feature requests, describe the use case and, if relevant, how it works in the JavaScript `qs` library.
+
+#### Example Issue Template
+```
+**Query:**
+user[name]=Alice&user[age]=30
+
+**Raised (go-qs):**
+map[user:map[age:30 name:Alice]]
+
+**Expected (JavaScript qs):**
+{ user: { name: 'Alice', age: '30' } }
+...
+
+**Environment:**
+goqs module version: v0.1.0
+Go version: go1.21.0
+OS: macOS
+```
+
+## Code Style
+- Follow Go conventions and idioms.
+- Use `gofmt` before submitting.
+
+## Questions
+If you have questions, open an issue or start a discussion.
+
+---
+
+Thank you for helping make go-qs better!

README.md

@@ -77,6 +77,11 @@ Run tests with:
 go test
 ```
 
+
+## Contributing
+
+We welcome contributions! Please see our [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines on pull requests and issues, including best practices for reporting bugs and comparing with the JavaScript `qs` library.
+
 ## License
 
 This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for details.