Add OSS header

Change-Id: I6f57c8b24d2ee847aec708d4d30a60b94121679e

manifest.xml

diff --git a/manifest.xml b/manifest.xml
index 9c36fc3..c7cf7f5 100644
--- a/manifest.xml
+++ b/manifest.xml
@@ -1,4 +1,20 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Copyright 2023 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.
+-->
+
 <manifest>
   <remote fetch="https://opensecura.googlesource.com" name="opensecura" review="https://opensecura-review.googlesource.com" />
   <remote name="android" fetch="https://android.googlesource.com" />