Added installation part

README.md

@@ -5,6 +5,18 @@ Contains only usable improvements for tutors.
 
 **This project is not officially supported by KIT or any other institutions assigned to KIT.**
 
+## Installation
+
+Clone the repository to your computer and install the extension in your browser as temporary / unpacked extension.
+
+### Mozilla Firefox
+
+See https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Temporary_Installation_in_Firefox
+
+### Google Chrome
+
+See https://developer.chrome.com/extensions/tut_debugging
+
 ## Improvements
 
 - Enable horizontal scrollbars