Create CONTRIBUTING.md

Author: JahidHasanCO

CONTRIBUTING.md

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+# Contributing to Diffly
+
+Thank you for your interest in contributing to Diffly! We welcome all kinds of contributions, including bug reports, feature requests, documentation improvements, and code contributions.
+
+## How to Contribute
+
+### 1. Fork the Repository
+
+Click the **Fork** button at the top right of this page to create your own copy of the repository.
+
+### 2. Clone Your Fork
+
+```bash
+git clone https://github.com/<your-username>/diffly.git
+cd diffly
+```
+
+### 3. Create a Branch
+
+Create a new branch for your work:
+
+```bash
+git checkout -b your-feature-name
+```
+
+### 4. Make Your Changes
+
+- Make your changes in the appropriate files.
+- Please include relevant tests if you are adding or changing functionality.
+- If updating documentation, please ensure it is clear and up to date.
+
+### 5. Run Tests
+
+Make sure all tests pass before submitting a pull request:
+
+```bash
+./gradlew test
+```
+
+### 6. Commit and Push
+
+Commit your changes with a descriptive message:
+
+```bash
+git add .
+git commit -m "Describe your change"
+git push origin your-feature-name
+```
+
+### 7. Open a Pull Request
+
+- Go to your fork on GitHub and open a pull request against the `main` branch of the original repository.
+- Please provide a clear description of your changes and reference any related issues.
+
+## Code Style
+
+- Follow Kotlin best practices.
+- Use descriptive variable and function names.
+- Write clear, concise commit messages.
+
+## Reporting Issues
+
+If you find any bugs or have feature requests, please [open an issue](https://github.com/JahidHasanCO/diffly/issues/new) and provide as much detail as possible.
+
+## Code of Conduct
+
+Please note we have a [Code of Conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code.
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the MIT License.
+
+---
+
+Thank you for helping to improve Diffly!