Add license preamble

Summary: Closes https://github.com/google/material-components-ios/issues/59

Reviewers: randallli, #material_components_ios_owners

Reviewed By: randallli, #material_components_ios_owners

Subscribers: randallli, featherless

Projects: #material_components_ios

Differential Revision: http://codereview.cc/D112

Author: Ian Gordon

scripts/gendocs.sh

@@ -1,4 +1,19 @@
 #!/bin/bash
+#
+# Copyright 2015-present Google Inc. All Rights Reserved.
+#
+# 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
+#
+# http://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.
+
 
 JAZZY_VERSION=`jazzy --version`
 if [[ $? != 0 ]]; then