chore: add library type to .repo-metadata.json (#1345)

diff --git a/.repo-metadata.json b/.repo-metadata.json
index 1b810b0..83a8540 100644
--- a/.repo-metadata.json
+++ b/.repo-metadata.json
@@ -1,4 +1,4 @@
-  
+
 {
     "name": "google-api-python-client",
     "name_pretty": "Google API Python Client",
@@ -6,6 +6,7 @@
     "issue_tracker": "https://github.com/googleapis/google-api-python-client/issues",
     "release_level": "ga",
     "language": "python",
+    "library_type": "REST",
     "repo": "googleapis/google-api-python-client",
     "distribution_name": "google-api-python-client"
-  }
\ No newline at end of file
+  }