Adding README.md

Author: Sebi

README.md

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+# DasherUI
+This repository features a simple UI, written in ImGui, for the DasherCore backend. Its main purpose is the testing/development of the DasherCore library. So it is not meant for pretty looks or actual usability. 
+
+## Cloning and Building
+1. Clone the repository with all submodules: `git clone --recursive https://github.com/PapeCoding/DasherUI.git ./DasherUI`
+2. Generate some project files with CMake:
+  * `cd ./DasherUI && mkdir build && cd build`
+  * `cmake ..`
+3. Build the project with the selected build system (e.g. Visual Studio on Windows or `make` on Linux)
+
+## Participate
+If you want to modernize some code within DasherCore or add UI features to the DasherUI repository, feel free to send a pull request!