Unregistered VCS root detected The directory /Users/*****/AndroidStudioProjects/Signin/google-services is under Git, but is not registered in the Settings.
Press "add root" when the warning message appears.
This will make idea register the "unregistered vcs root", and you can use the git features of IDEA/Android studio. Nothing bad will happen if you do not press "add root", but I suspect you will get the same warning on each startup of android studio/IDEA.