Add METADATA to yapf: Apache2=NOTICE am: 69c2389ca7 am: 10b199108a

Change-Id: Iffb169b3de783659eef380188b5e37aa5710e104
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
+}