Update links in README.
Update links in README.

Change-Id: I879d75016c4209afb2b1cde4fb1238bdff1acf5e

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