README: add policy for new packages

Fixes golang/oauth2#325

Change-Id: I3a9ad8ce1e974bb399356b18819c6b0fe60f7051
Reviewed-by: Ross Light <>
diff --git a/ b/
index 94ffd73..68f436e 100644
--- a/
+++ b/
@@ -70,6 +70,13 @@
+## Policy for new packages
+We no longer accept new provider-specific packages in this repo. For
+defining provider endpoints and provider-specific OAuth2 behavior, we
+encourage you to create packages elsewhere. We'll keep the existing
+packages for compatibility.
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