Merge branch 'feature/update-readme-for-gitlab' into 'develop'

TASK: Update readme with project website

See merge request !66

Readme.rst

@@ -7,10 +7,16 @@ Our goal is to provide an automated migration for TYPO3 updates.
 
 This should include source code modifications like adjusting old legacy class names to new ones.
 
+The official project home page can be found at https://git.higidi.com/Automated-TYPO3-Update/automated-typo3-update .
+Please open new issues and merge requests there. You can login with your Github account.
+
+Github is just used as a mirror for the project.
+
 Requirements
 ============
 
-- ``composer`` needs to be installed and inside your ``$PATH``.
+- ``composer`` needs to be installed and inside your ``$PATH``. Otherwise run ``make
+  install-composer``.
 
 Installation
 ============