How you can help section in Readme.md

Added a How you can help section to the readme. 
Update README.md
Update README.md
Update README.md
Update README.md
Added acknowledgement of ONRG and ADL Co-Labs
Merge pull request #198 from evangelia-mitsopoulou/master

Mobler Cards Version 2 beta Layout/Multiple LMS Selection/Landing Page
Merge pull request #220 from evangelia-mitsopoulou/master

Featured Content + Cloze Question Type + Transitions Refactoring
Update textualStrings.properties
Update textualStrings_de.properties
Update textualStrings_de.properties
textlücke ist nun ein Lückentext
Merge remote-tracking branch 'refs/remotes/upStream/master'
layout polishing:
a) feedback view of close question scrrolls
b) feedback more displays also the last line in long feedback tips texts
polishing on taping of exclusive content on landing view. sometimes it didn't navigate to the new page
fixed Issue #227