Added documentation

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