Update embed.go
Add Apache License header to the file.
diff --git a/v2/assets/embed.go b/v2/assets/embed.go
index f10d363..42bcb63 100644
--- a/v2/assets/embed.go
+++ b/v2/assets/embed.go
@@ -1,3 +1,16 @@
+// Copyright 2022 Google Inc.
+//
+// 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.
package assets
import (
