Created Notify_clickatell (markdown)

Notify_clickatell.md

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+## Clickatell Notifications
+* **Source**: https://www.clickatell.com/
+* **Icon Support**: No
+* **Message Format**: Text
+* **Message Limit**: 160 Characters per message
+
+### Syntax
+Valid syntax is as follows:
+* `clickatell://{source}@{apikey}/{PhoneNo}`
+* `clickatell://{source}@{apikey}/{PhoneNo1}/{PhoneNo2}/{PhoneNoN}`
+* `clickatell://{apikey}/{PhoneNo}`
+* `clickatell://{apikey}/{PhoneNo1}/{PhoneNo2}/{PhoneNoN}`
+
+### Parameter Breakdown
+| Variable        | Required | Description
+| --------------- | -------- | -----------
+| apikey         | **Yes**   | The API Key you generated as part of your Clickatell account
+
+#### Example
+Send a notification to your Clickatell account:
+```bash
+# Assuming our {apikey} is token
+# Assuming our {PhoneNo} is 1-800-555-1234
+apprise -vv --body="Test Message" \
+   "clickatell://token/1-800-555-1234"
+```