Add release notes for new UI
Add release notes for new UI

Reviewed at https://reviews.apache.org/r/63306/

medallia/aurora,thinker0/aurora,rdelval/aurora,thinker0/aurora,crashlytics/aurora,apache/aurora,medallia/aurora,thinker0/aurora,crashlytics/aurora,apache/aurora,thinker0/aurora,rdelval/aurora,thinker0/aurora,apache/aurora,crashlytics/aurora,medallia/aurora,thinker0/aurora,medallia/aurora,medallia/aurora,apache/aurora,crashlytics/aurora,rdelval/aurora,rdelval/aurora,apache/aurora,crashlytics/aurora,crashlytics/aurora,apache/aurora,rdelval/aurora,medallia/aurora,rdelval/aurora