Add reference to model card for the same model

cc

@julien-c



@Meg



@Ezi

README.md

@@ -2,3 +2,5 @@
 language: de
 license: mit
 ---
+
+This model is the same as [dbmdz/bert-base-german-uncased](dbmdz/bert-base-german-uncased). See the [dbmdz/bert-base-german-cased model card](dbmdz/bert-base-german-uncased) for details on the model.