Add package-info.java

Author: schmidt-sebastian

firebase-firestore/src/main/java/com/google/firebase/firestore/model/protovalue/package-info.java

@@ -0,0 +1,19 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/** @hide */
+@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
+package com.google.firebase.firestore.model.protovalue;
+
+import androidx.annotation.RestrictTo;