Added markdown and image files for notify clickatell SMS message plat… (#3569)

* Added markdown and image files for notify clickatell SMS message platform

* Update notify.clickatell.markdown

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+---
+layout: page
+title: "Clikatell SMS"
+description: "Instructions on how to add Clickatell notifications to Home Assistant."
+date: 2017-10-09 00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: clickatell.png
+ha_category: Notifications
+ha_release: 0.56
+---
+
+
+The `clickatell` platform uses [Clickatell](https://clickatell.com) to deliver SMS notifications from Home Assistant.
+
+### Get your Clickatell API Credentials
+Go to your [Clickatell SMS Platform Portal](https://portal.clickatell.com/#/) section and create a new SMS integration. There are three screens of information required to creater an integration. Please ensure the following:
+
+1. Give the new Integration an identification name
+2. ensure it is set for 'production' use
+3. select 'HTTP' as your API type
+4. Ensure that the you select for the messaging type to be 'one way messaging'
+5. Be aware of the international number format option as this impacts the structure of the phone numbers you provide  
+6. Once you have completed entering your details an API key is generated. Copy the API key
+
+### Configuration
+To add Clickatell to your installation, add the following to your Home Assistant `configuration.yaml` file:
+
+```yaml
+notify:
+  - platform: clickatell
+    name: USER_DEFINED_NAME
+    api_key: CLICKATELL_API_KEY
+    recipient: PHONE_NO
+```
+
+Configuration variables:
+
+* **name** (Optional): Setting the optional parameter name allows multiple notifiers to be created. The default value is `Clickatell`. The notifier will bind to the service notify.NOTIFIER_NAME.
+* **api_key** (Required): Your `API Key`.
+* **recipient** (Required): Your phone no. This is where you want to send your notification SMS messages. eg: `61444333444`
+
+
+To use notifications, please see the [getting started with automation page](https://home-assistant.io/getting-started/automation/).