add grpc-auth-support.md (tls only)

grpc-auth-support.md

@@ -0,0 +1,23 @@
+# Authentication
+
+As outlined <a href="https://github.com/grpc/grpc-common/blob/master/grpc-auth-support.md">here</a> gRPC supports a number of different mechanisms for asserting identity between an client and server. We'll present some code-samples here demonstrating how to provide TLS support encryption and identity assertions as well as passing OAuth2 tokens to services that support it.
+
+# Enabling TLS on a gRPC client
+
+```Go
+conn, err := grpc.Dial(serverAddr, grpc.WithClientTLS(credentials.NewClientTLSFromCert(nil, ""))
+```
+
+# Enableing TLS on a gRPC server
+
+```Go
+creds, err := credentials.NewServerTLSFromFile(*certFile, *keyFile)
+if err != nil {
+  log.Fatalf("Failed to generate credentials %v", err)
+}
+server.Serve(creds.NewListener(lis))
+```
+
+# Using OAuth2
+
+