Add license to Makefile

Change-Id: Ib1b6ebc1edae8007c1545088cce18292861351b6
diff --git a/Makefile b/Makefile
index 9279a00..30dbb42 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,17 @@
+# Copyright 2020 The Android KVM Authors
+#
+# 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.
+
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 ## Folders
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