added nexmo sms api plugin

nexmo_sms_notification/README.md

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+#**SMS Notification using Nexmo API**
+
+This script shows how easy it is to integrate Nexmo SMS notifications from your Pantheon project using Quicksilver. As a bonus, we also show you how to manage API keys outside of your site repository.
+
+Instructions
+
+1. [Sign up and Register at Nexmo and get free credits](https://dashboard.nexmo.com/sign-up) from your Nexmo SMS Website. You may use this sms api in more 225 countries. 
+
+2. Clone the repo and run composer in root folder of nexmo plugin
+```
+composer require nexmo/client
+```
+
+3. Copy the following variables:
+
+ * nexmo_api_key
+ * nexmo_api_secret
+ * primary_mobile_number
+
+  into a file called `secrets.json` and store it in the [private files](https://pantheon.io/docs/articles/sites/private-files/) directory of every environment where you want to trigger Nexmo SMS notifications.
+
+  ```
+  $> echo '{"nexmo_api_key": "xxxxxxxxxxxxxxxxx", "nexmo_api_secret": "xxxxxxxxxxxxxx", "primary_mobile_number": "xxxxxxxxxxxxxx"}' > secrets.json
+  # Note, you'll need to copy the secrets into each environment where you want to trigger Chikka SMS notifications.
+  $> `terminus site connection-info --env=dev --site=your-site --field=sftp_command`
+      Connected to appserver.dev.xxxxxxx-xxxxxx-xxxxx-xxxxx.drush.in.
+  sftp> cd files  
+  sftp> mkdir private
+  sftp> cd private
+  sftp> put secrets.json
+  ```
+
+4. Add the example `nexmo_sms_notification/notify.php` script to the private directory in the root of your site's codebase, that is under version control. Note this is a different private directory than where the secrets.json is stored. Make sure that you include the vendors inside nexmo_sms_notification/ folder
+
+
+5. Add Quicksilver operations to your `pantheon.yml`
+
+6. Test a deploy from your dashboard!
+
+Optionally, you may want to use the terminus workflows watch command to get immediate debugging feedback. You may also want to customize your notifications further. 
+
+Example pantheon.yml
+
+Here's an example of what your `pantheon.yml` would look like if this were the only Quicksilver operation you wanted to use. Pick and choose the exact workflows that you would like to see notifications for.
+
+```
+api_version: 1
+
+workflows:
+  deploy:
+    after:
+        - type: webphp
+          description: send sms on deploy
+          script: private/scripts/nexmo_sms_notification/notify.php
+  sync_code:
+    after:
+        - type: webphp
+          description: send sms on sync code
+          script: private/scripts/nexmo_sms_notification/notify.php
+  clear_cache:
+    after:
+        - type: webphp
+          description: send sms when clearing cache
+          script: private/scripts/nexmo_sms_notification/notify.php
+```

nexmo_sms_notification/composer.json

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+{
+    "require": {
+        "nexmo/client": "^1.8"
+    }
+}