wip: start converting README from adoc to md

Author: codayon

README.md

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+# OpenBangla Keyboard (OBK)
+
+OpenBangla Keyboard is an open-source, Unicode-compliant Bangla input method for GNU/Linux, macOS, and Windows. As a comprehensive typing solution, it features advanced automation tools and supports popular layouts including Avro Phonetic, Probhat, Munir Optima, and National (Jatiya).
+
+Most features of [Avro Keyboard](https://github.com/mugli/Avro-Keyboard) are present in OpenBangla Keyboard. So Avro Keyboard users will feel right at home in Linux with OpenBangla Keyboard.
+
+## Installation
+
+For GNU/Linux and macOS
+
+```sh
+curl -fsSL https://openbangla.github.io/install | bash
+```
+
+For Windows
+
+```powershell
+irm openbangla.github.io/install.ps1 | iex
+```
+
+## Community
+
+We are on [Github Discussions](https://github.com/OpenBangla/OpenBangla-Keyboard/discussions) and [Facebook](https://www.facebook.com/openbanglakeyboard).
+
+## Contributing
+
+We welcome contributions! To get started:
+
+1. Fork the repository.
+2. Create a new branch (`git checkout -b feature-branch`).
+3. Commit your changes (`git commit -m 'Add new feature'`).
+4. Push to the branch (`git push origin feature-branch`).
+5. Open a Pull Request.
+
+## Acknowledgements
+
+- [Mehdi Hasan Khan](https://github.com/mugli), for originally developing and maintaining Avro Keyboard.
+- [Rifat Nabi](https://github.com/torifat), for porting Avro Phonetic to Javascript.
+- [Sarim Khan](https://github.com/sarim), for writing ibus-avro.
+- [Saiful Islam](https://github.com/saaiful), for the icon.
+- [Material Design Icons](https://material.io/resources/icons).
+- [QSimpleUpdater](https://github.com/alex-spataru/QSimpleUpdater), for providing update mechanism.
+
+## License
+
+This project is licensed under [GPL 3 Licence](https://opensource.org/licenses/GPL-3.0).
+
+Made with ❤️ by [Muhammad Mominul Huque](https://github.com/mominul) and [✨ contributors ✨](https://github.com/OpenBangla/OpenBangla-Keyboard/graphs/contributors)!