Add METADATA to grpc-grpc: Apache2+BSD+MIT+ISC+zlib=NOTICE am: 42c9239802 am: 212bf5d476

Change-Id: Id4c7a1da74e6178db4c9fbbfb440ea766fd6bb1c
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
+}