Add sample for Google+ Domains API in PHP

domains-php-sample/README.md

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+# Google+ Domains API PHP Sample
+
+### Description
+
+This is simple example to illustrate how to use
+[domain-wide delegation](https://developers.google.com/+/domains/authentication/delegation)
+with the [Google+ Domains API](https://developers.google.com/+/domains/) in PHP.
+
+This also shows how you can use the Google+ Domains API in combination with the
+[Directory API](https://developers.google.com/admin-sdk/directory/) to list all users
+in your domain and perform Google+ related tasks on their behalf.
+
+
+### Setup
+
+1.  Follow the steps of the [official docs](https://developers.google.com/+/domains/authentication/delegation)
+    to enable domain-wide delegation for your domain.
+
+    For this example you will need to authorize the following scopes:
+
+```
+https://www.googleapis.com/auth/admin.directory.user.readonly
+https://www.googleapis.com/auth/plus.me
+https://www.googleapis.com/auth/plus.stream.read
+```
+
+2.  You also need to authorize API Access for Administrative APIs in `Security / API Reference`
+    in your Domain Admin panel to enable the Admin SDK APIs that include the Directory API
+
+3.  Change the values of `CLIENT_ID`, `SERVICE_ACCOUNT_EMAIL`, `KEY_FILE`, `DOMAIN_ADMIN_EMAIL`
+    and `DOMAIN` in `index.php` accordingly.
+
+
+### License    
+
+```
+Copyright 2011-2013 Gerwin Sturm, FoldedSoft e.U. / www.foldedsoft.at
+
+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.
+```