chore: add library type to .repo-metadata.json (#15)

Author: parthea

packages/google-cloud-appengine-admin/.repo-metadata.json

@@ -6,6 +6,7 @@
     "issue_tracker": "",
     "release_level": "beta",
     "language": "python",
+    "library_type": "GAPIC_AUTO",
     "repo": "googleapis/python-appengine-admin",
     "distribution_name": "google-cloud-appengine-admin",
     "api_id": "appengine.googleapis.com"