chore: update templates (#44)

diff --git a/MANIFEST.in b/MANIFEST.in
index cd011be..e9e29d1 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,6 +1,25 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 # Generated by synthtool. DO NOT EDIT!
 include README.rst LICENSE
 recursive-include google *.json *.proto
 recursive-include tests *
 global-exclude *.py[co]
 global-exclude __pycache__
+
+# Exclude scripts for samples readmegen
+prune scripts/readme-gen
\ No newline at end of file