docs: add contributing guidelines

Author: codayon

CONTRIBUTING.md

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+# Contributing to OpenBangla Keyboard (OBK)
+
+Thank you for your interest in contributing to OpenBangla Keyboard! We welcome contributions of all kinds, whether it's code, documentation, bug reports, feature requests, or helping fellow contributors.
+
+Please take a moment to review this guide before submitting your contribution.
+
+## Code of Conduct
+
+We expect all contributors to adhere to our [Code of Conduct](CODE_OF_CONDUCT.md). Please read it carefully and ensure you understand and agree to its terms.
+
+## How Can I Contribute?
+
+There are many ways you can contribute to this project:
+
+### Reporting Bugs
+
+If you encounter a bug, please help us by submitting a detailed issue. When reporting a bug, please include:
+
+- **A clear and descriptive title** for the issue.
+- **Steps to reproduce the bug** as precisely as possible.
+- **What you expected to happen** instead of the actual outcome.
+- **Any relevant environment information**, such as your operating system, software versions, and any specific configurations.
+- **If possible, include any error messages or screenshots** that might be helpful.
+
+### Suggesting Enhancements
+
+We are always open to suggestions for new features and improvements. When suggesting an enhancement, please consider:
+
+- **Clearly describe the proposed enhancement** and its benefits.
+- **Explain the use case** and why you believe this enhancement would be valuable.
+- **If possible, suggest how the enhancement might be implemented.**
+- **Check if a similar feature request already exists** before creating a new one.
+
+### Contributing Code or Documentation
+
+If you'd like to contribute code or documentation, please follow these steps:
+
+1.  **Fork the repository** on your GitHub account
+2.  **Clone your fork** to your local machine
+3.  **Create a new branch** for your changes and choose a descriptive name (e.g., feature/smth, fix/smth)
+4.  **Make your changes** and ensure your code follows the project's coding style (if applicable)
+5.  **Add your changes** to Git
+6.  **Commit your changes** with a clear and concise commit message. It's highly encouraged follow [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) for commit messages which will help us to auto-generate `CHANGELOG.md`
+7.  **Push your branch** to your fork on GitHub
+8.  **Create a Pull Request (PR)** targeting OBK's `develop` branch and while creating your PR, it's highly appreciated if you follow [Semantic PR](https://pulsar.apache.org/contribute/develop-semantic-title/) conventions
+
+> NOTE: All documentation for OBK will be managed in the [OpenBangla/manual](https://github.com/OpenBangla/manual) repository. Its contribution guidelines are the preferred and prioritized source for documentation contributions.
+
+## Questions?
+
+If you have any questions about contributing, feel free to ask in [GitHub Discussions](https://github.com/OpenBangla/OpenBangla-Keyboard/discussions)!
+
+Thank you again for your contribution! We appreciate your time and effort in making OBK better.