Add METADATA to rappor: Apache2=NOTICE am: 2b68dfbdc6

Change-Id: Ibd5f1b6a38cf03b78f7eac6c2f656364ef313de5
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..d97975c
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,3 @@
+third_party {
+  license_type: NOTICE
+}