Add sender (#4422)

source/_components/notify.clicksend.markdown

@@ -18,10 +18,10 @@ The `clicksend` platform uses [ClickSend](https://clicksend.com) to deliver noti
 ### Get your ClickSend API Credentials
 Go to your [ClickSend Dashboard](https://dashboard.clicksend.com) section and create your new project. After creating your project, you should now be able to obtain your `username` and `api_key`.
 
-### Configuration
 To add ClickSend to your installation, add the following to your Home Assistant `configuration.yaml` file:
 
 ```yaml
+# Example configuration.yaml entry
 notify:
   - platform: clicksend
     name: ClickSend
@@ -30,12 +30,28 @@ notify:
     recipient: PHONE_NO
 ```
 
-Configuration variables:
-
-* **name** (Optional): Setting the optional parameter name allows multiple notifiers to be created. The default value is `ClickSend`. The notifier will bind to the service notify.NOTIFIER_NAME.
-* **username** (Required): Your `Username`.
-* **api_key** (Required): Your `API Key`.
-* **recipient** (Required): Your phone no. This is where you want to send your notification SMS messages. eg: `09171234567`
-
+{% configuration %}
+name:
+  description: "Setting the optional parameter name allows multiple notifiers to be created. The default value is `ClickSend`. The notifier will bind to the service `notify.NOTIFIER_NAME`."
+  required: false
+  type: string
+username:
+  description: Your Clicksend username.
+  required: true
+  type: string
+api_key:
+  description: Your Clicksend API Key.
+  required: true
+  type: string
+recipient:
+  description: "Your phone number. This is where you want to send your notification SMS messages, e.g., `09171234567`."
+  required: true
+  type: string
+sender:
+  description: The name or number of the sender.
+  required: false
+  type: string
+  default: recipient
+{% endconfiguration %}
 
 To use notifications, please see the [getting started with automation page](https://home-assistant.io/getting-started/automation/).