Change readme

Readme.md

-# This is the TESTING environment of studip docker
+# Stud.IP Docker image
 
-To make testing branches as smooth as possible. Please have docker and docker-compose installed on your machine.
-
-- Windows: https://docs.docker.com/docker-for-windows/install/
-- Mac: https://docs.docker.com/docker-for-mac/install/
-
-To setup a new test environment simply modify:
-
-1. Checkout this branch
-2. Modify **BRANCH: dev-branches/StEP00349** in *docker-compose.yml* to the branch you want to test.
-3. Call `docker-compose build --no-cache` to make sure you build the correct branch
-4. Use `docker-compose up -d` to start your Stud.IP
-5. Goto http://localhost:80 and start your test
-6. Use `docker-compose down` to stop Stud.IP
\ No newline at end of file