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

Change-Id: Iea0f38d7ea730b9922775743f0535409af5ea93f
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
+}