Docs: Add CONTRIBUTING.md for contribution guidelines (#402)

* docs: Add CONTRIBUTING.md file

* docs: Link to dedicated documentation repository

Author: Reshad Ahammed Ayon

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
+
+If you'd like to contribute code, please follow these steps:
+
+1.  **Fork the repository** on GitHub.
+2.  **Clone your fork** to your local machine:
+
+    ```bash
+    git clone --recursive https://github.com/OpenBangla/OpenBangla-Keyboard.git
+    cd OpenBangla-Keyboard
+    ```
+
+3.  **Create a new branch** for your changes. Choose a descriptive name:
+
+    ```bash
+    git checkout -b feature/your-feature-name
+    # or
+    git checkout -b bugfix/your-bug-fix
+    ```
+
+4.  **Make your changes** and ensure your code follows the project's coding style (if any).
+5.  **Add your changes** to Git:
+
+    ```bash
+    git add .
+    ```
+
+6.  **Commit your changes** with a clear and concise commit message. Follow these guidelines for commit messages:
+
+    - Separate the subject from the body with a blank line.
+    - Try limiting the subject line to 50 characters.
+    - Do not end the subject line with a period.
+    - Use the imperative mood ("Fix bug", "Add feature").
+    - Optionally, provide a more detailed body for context.
+
+    ```bash
+    git commit -m "Add feature: Implement bangla spell checker"
+    ```
+
+7.  **Push your branch** to your fork on GitHub:
+
+    ```bash
+    git push origin your-feature-name
+    ```
+
+8.  **Create a Pull Request (PR)** through the GitHub website. When creating a PR:
+
+    - Provide a clear and descriptive title for your PR.
+    - In the description, explain the changes you've made and the problem they solve (if applicable).
+    - Reference any related issues in the PR description (e.g., `Closes #123`, `Fixes #456`).
+
+### Contributing Documentation
+
+Good documentation is crucial! We have a dedicated repository for OpenBangla Keyboard documentation: https://github.com/OpenBangla/manual. Most documentation contributions should be made there, unless it's something that is related to this repository. If you'd like to contribute to the documentation:
+
+- **Submit issues** for any unclear or incorrect documentation you find.
+- **Create pull requests** to fix typos, improve clarity, or add new documentation. Follow the same Git workflow as contributing code. Ensure your documentation changes are well-formatted (e.g., using AsciiDoc or Markdown).
+
+`Note: The contribution guidelines in the OpenBangla/manual repository are the preferred and prioritized source for documentation contributions.`
+
+## Pull Request Guidelines
+
+To ensure your pull request is reviewed and merged efficiently, please follow these guidelines:
+
+- **Target your pull request to the `develop` branch** (or the designated development branch), not the `main` branch.
+- **Keep your PR focused** on a single issue or feature. Avoid making unrelated changes in the same PR.
+- **Ensure your code builds and passes all tests** (if applicable).
+- **Follow the project's coding style** and conventions.
+- **Write clear and concise commit messages.**
+- **Provide a detailed description** in your pull request explaining your changes and their purpose.
+- **Be responsive to feedback** during the code review process.
+
+## 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.