Add METADATA to grpc-grpc: Apache2+BSD+MIT+ISC+zlib=NOTICE am: 42c9239802 am: 212bf5d476 am: 524016bb26 am: 7bf848eab2 am: daf7adced8 am: 2a0120169b

Change-Id: I8cfec151d54dcefa24d957641ecd46929302c018
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
+}