Update README.md
Merge pull request #1 from Simon290/master

Update README.md
Merge branch 'master' of github.com:DHBW-Loerrach/dhbw-organizer

Conflicts:
	README.md
ADD Enddate for TestVersion
add error Message by adding Calendar and no Internet connection
Merge branch 'master' of github.com:dan-42/dhbw-organizer