Added documentation

LICENSE

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+MIT License
+
+Copyright (c) 2026 gora
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# soundboard
+
+A minimal soundboard for Linux, using PipeWire and Qt6.
+
+## Building
+
+This project uses [CMake](https://cmake.org/) as it's build system. To build
+the project run the following commands:
+
+```console
+$ mkdir build
+$ cd build
+$ cmake ..
+$ make
+```
+
+The final `soundboard` executable will be located in the build directory.
+
+### Build dependencies
+
+- [Qt6](https://www.qt.io/development/qt-framework), the UI framework library
+
+### Runtime dependencies
+
+- [MPV](https://mpv.io/), the media player