Add METADATA to piex: Apache2=NOTICE am: aebc3d7078 am: d26a14360f am: 6672dabd7c am: f80bdaa14a

Change-Id: Icb6f3072f1af8590c3eeb80c265e19a43df502ed
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
+}