Initial checkin of Apps Script forms API samples

forms-api/snippets/README.md

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+The Google Forms API is currently in Restricted Beta. To use the API and these
+samples prior to General Availability, your Google Cloud project must be
+allowlisted. To request that your project be allowlisted, complete the
+[Early Adopter Program application](https://developers.google.com/forms/api/eap).

forms-api/snippets/retrieve_all_responses.gs

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+# Copyright 2021 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.
+
+ # [START forms_retrieve_all_responses]
+ function callFormsAPI() {
+  Logger.log('Calling the Forms API!');
+  var formId = '<YOUR_FORM_ID>';
+
+  // Get OAuth Token
+ var OAuthToken = ScriptApp.getOAuthToken();
+ Logger.log('OAuth token is: ' + OAuthToken);
+ var formsAPIUrl = 'https://forms.googleapis.com/v1beta/forms/' + formId + '/' + 'responses';
+ Logger.log('formsAPIUrl is: ' + formsAPIUrl);
+ var options = {
+    'headers': {
+      Authorization: 'Bearer ' + OAuthToken,
+      Accept: 'application/json'
+    },
+    'method': 'get'
+  };  
+var response = UrlFetchApp.fetch(formsAPIUrl, options);
+ Logger.log('Response from forms.responses was: ' + response);
+}
+# [END forms_retrieve_all_responses]