feat: add create membership for group code sample (#921)

Co-authored-by: pierrick <pierrick@google.com>

chat/client-libraries/cloud/create-membership-user-cred-for-group.js

@@ -0,0 +1,50 @@
+/**
+ * Copyright 2024 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.
+ */
+// It may require modifications to work in your environment.
+
+// [START chat_create_membership_user_cred_for_group]
+
+import {createClientWithUserCredentials} from './authentication-utils.js';
+
+const USER_AUTH_OAUTH_SCOPES = ['https://www.googleapis.com/auth/chat.memberships'];
+
+// This sample shows how to create membership with user credential for a group
+async function main() {
+  // Create a client
+  const chatClient = await createClientWithUserCredentials(USER_AUTH_OAUTH_SCOPES);
+
+  // Initialize request argument(s)
+  const request = {
+    // Replace SPACE_NAME here.
+    parent: 'spaces/SPACE_NAME',
+    membership: {
+      groupMember: {
+        // Replace GROUP_NAME here
+        name: 'groups/GROUP_NAME'
+      }
+    }
+  };
+
+  // Make the request
+  const response = await chatClient.createMembership(request);
+
+  // Handle the response
+  console.log(response);
+}
+
+main().catch(console.error);
+
+// [END chat_create_membership_user_cred_for_group]

chat/client-libraries/cloud/package.json

@@ -15,6 +15,7 @@
   },
   "scripts": {
     "create-membership-user-cred-for-app.js": "node ./create-membership-user-cred-for-app.js",
+    "create-membership-user-cred-for-group.js": "node ./create-membership-user-cred-for-group.js",
     "create-membership-user-cred.js": "node ./create-membership-user-cred.js",
     "create-message-app-cred.js": "node ./create-message-app-cred.js",
     "create-message-user-cred-at-mention.js": "node ./create-message-user-cred-at-mention.js",