Adding missing license header.
Adding missing license header.

JSergioSette/git-sergio,jvkops/android-demos,gsuitedevs/android-samples,AzureZhao/android-demos,googleworkspace/android-samples,KitAway/android-demos,ArfaaShariff/android-demos,JSergioSette/git-sergio2,beonit/android-demos,googledrive/android-demos