adds apache header

sdks/unity/Tests/Runtime/PlayMode/AgonesSdkComplianceTests.cs

@@ -1,3 +1,18 @@
+// Copyright 2022 Google LLC
+// All Rights Reserved.
+//
+// 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.
+
 using System.Collections;
 using System.Threading.Tasks;
 using Agones;

sdks/unity/Tests/TestingEnvironment/MockAgonesSdkServer.cs

@@ -1,3 +1,18 @@
+// Copyright 2022 Google LLC
+// All Rights Reserved.
+//
+// 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.
+
 using System;
 using System.Collections.Generic;
 using System.Net;