update readme

README.md

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 # LibrarySystem
 
 universal library system for facilities in the university
+
+
+## What is this?
+
+This is a library system for the different facilities in the university. Because some facilities lend their media, some wanted a software that allows them to keep track of who had what when.
+
+### Installation
+either clone the Repo
+```
+git clone https://git.theprivateserver.de/WorldTeacher/LibrarySystem.git
+cd LibrarySystem
+./build(.exe)
+```
+
+or head over to [releases](https://git.theprivateserver.de/WorldTeacher/LibrarySystem/releases)
+and download the latest version
+
+### Configuration
+
+the software contains a config file in configs, as well as a config for icons, located in icons. 
+
+#### config
+tbd
+
+#### icons
+- color is a value to re-paint the icons
+- icons/* a dict of the icons structured like: icon_Name_in_Application : icon_File_name