Update README.md

Update license
Update README.md

Make license clickable
Update README.md

Fix license link
Add license file
Merge pull request #25 from Postmedia-Digital/add-license

Add license file
Update README.md

Update formatting and license link
corrected debug display behaviour
Merge branch 'master' into performance-optimization
Merge branch 'performance-optimization' of github.com:Postmedia-Digital/cordova-ads into performance-optimization