Adding NOTICE

NOTICE

+# 3rd-Party Software License Notice
+Generated by fossa-cli (https://github.com/fossas/fossa-cli).
+This software includes the following software and licenses:
+
+========================================================================
+Apache-2.0
+========================================================================
+The following software have components provided under the terms of this license:
+
+- appengine (from https://github.com/golang/appengine)
+- go-genproto (from https://github.com/google/go-genproto)
+- gocloud (from https://code.googlesource.com/gocloud)
+- google-api-go-client (from https://code.googlesource.com/google-api-go-client)
+- grpc-go (from https://github.com/grpc/grpc-go)
+
+========================================================================
+BSD-3-Clause
+========================================================================
+The following software have components provided under the terms of this license:
+
+- appengine (from https://github.com/golang/appengine)
+- context (from https://github.com/gorilla/context)
+- gax-go (from https://github.com/googleapis/gax-go)
+- go-difflib (from https://github.com/pmezard/go-difflib)
+- google-api-go-client (from https://code.googlesource.com/google-api-go-client)
+- mux (from https://github.com/gorilla/mux)
+- net (from https://go.googlesource.com/net)
+- oauth2 (from https://go.googlesource.com/oauth2)
+- protobuf (from https://github.com/golang/protobuf)
+- text (from https://go.googlesource.com/text)
+
+========================================================================
+CC-BY-3.0
+========================================================================
+The following software have components provided under the terms of this license:
+
+- google-api-go-client (from https://code.googlesource.com/google-api-go-client)
+- net (from https://go.googlesource.com/net)
+
+========================================================================
+CC-BY-SA-4.0
+========================================================================
+The following software have components provided under the terms of this license:
+
+- text (from https://go.googlesource.com/text)
+
+========================================================================
+MIT
+========================================================================
+The following software have components provided under the terms of this license:
+
+- cors (from https://github.com/rs/cors)
+- go-spew (from https://github.com/davecgh/go-spew)
+- goblin (from https://github.com/franela/goblin)
+- google-api-go-client (from https://code.googlesource.com/google-api-go-client)
+- jwt-go (from https://github.com/dgrijalva/jwt-go)
+- testify (from https://github.com/stretchr/testify)
+
+========================================================================
+public-domain
+========================================================================
+The following software have components provided under the terms of this license:
+
+- google-api-go-client (from https://code.googlesource.com/google-api-go-client)
+
+