Add remote platform docs to directv (#12365)

* Update directv.markdown

* Update directv.markdown

source/_integrations/directv.markdown

@@ -3,6 +3,7 @@ title: DirecTV
 description: Instructions on how to integrate DirecTV receivers into Home Assistant.
 ha_category:
   - Media Player
+  - Remote
 ha_release: 0.25
 ha_iot_class: Local Polling
 ha_domain: directv
@@ -59,3 +60,66 @@ Available services: turn_on, turn_off, media_play, media_pause, media_stop, medi
 | `entity_id`            |      yes | Target a specific media player. Defaults to all.                                                                                                                       |
 | `media_content_id`     |       no | The channel number to change to.                   |
 | `media_content_type`   |       no | A media type. Has to be `channel`.
+
+## Remote
+
+The DirecTV remote platform allows you to send remote control buttons to a DirecTV receiver. It is automatically set up when a DirecTV receiver is configured.
+
+At the moment, the following buttons are supported:
+
+- `power`
+- `poweron`
+- `poweroff`
+- `format`
+- `pause`
+- `rew`
+- `replay`
+- `stop`
+- `advance`
+- `ffwd`
+- `record`
+- `play`
+- `guide`
+- `active`
+- `list`
+- `exit`
+- `back`
+- `menu`
+- `info`
+- `up`
+- `down`
+- `left`
+- `right`
+- `select`
+- `red`
+- `green`
+- `yellow`
+- `blue`
+- `chanup`
+- `chandown`
+- `prev`
+- `0`
+- `1`
+- `2`
+- `3`
+- `4`
+- `5`
+- `6`
+- `7`
+- `8`
+- `9`
+- `dash`
+- `enter`
+
+A typical service call for press several buttons looks like this.
+
+```yaml
+service: remote.send_command
+data:
+  entity_id: remote.directv_entity
+  command:
+    - left
+    - left
+    - menu
+    - select
+```