Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+We welcome contributions to this repository! If you have a property test to add, follow these steps:
+
+1. **Fork the repository** and clone it to your local machine.
+2. **Add a new property test**: Create a new `.md` file under the `property-tests` directory. Add tests relevant to the data structure or algorithm you're targeting.
+3. **Follow best practices**: Ensure that your property tests are written in a clear, understandable format. See the existing tests for examples.
+4. **Submit a pull request**: Once you've added your test(s), open a pull request with a brief description of your changes.
+5. **Test your code**: If applicable, provide links to the relevant property testing framework or language-specific tools used to verify your tests.
+
+## Best Practices
+
+- **Keep tests simple**: Focus on one property per test.
+- **Provide clear explanations**: Describe the property you're testing and the reasoning behind it.
+- **Document the tool or framework**: If your property test requires a specific framework, be sure to mention it.
+
+## Reporting Issues
+
+If you encounter any broken tests or have suggestions for additional properties to test, feel free to [open an issue](https://github.com/Forward-Lang/awesome-property-testing/issues). 
+We're always looking for ways to improve the repository.