documentation for synology chat as a notification platform (#4730)

* documentation for synology chat as a notification platform

* Add ha_release and logo

source/_components/notify.synology_chat.markdown

@@ -0,0 +1,34 @@
+---
+layout: page
+title: "Synology Chat"
+description: "Instructions how to add a Synology Chat Bot notifications to Home Assistant."
+date: 2018-02-15 07:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_release: 0.65
+logo: synology.png
+ha_category: Notifications
+---
+
+The `synology_chat` notification platform allows you to deliver notifications to your [Synology Chat](https://www.synology.com/en-us/dsm/feature/chat) install as a Synology Chat bot.
+
+To configure a Synology Chat bot, first you must create a [Synology Chat Integration Incoming Webhook](https://www.synology.com/en-us/knowledgebase/DSM/tutorial/Collaboration/How_to_configure_webhooks_and_slash_commands_in_Chat_Integration#t2.1). After this is complete, you will have a Webhook URL. This is what will be required in the Home Assistant configuration.
+
+To enable the Synology Chat notification in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+notify:
+  - platform: synology_chat
+    name: hass_synchat
+    resource: https://example.your.synology.com/webapi/entry.cgi?api=SYNO.Chat.External&method=incoming&version=1&token=ABCDEFG
+```
+
+Configuration variables:
+
+- **name** (*Required*): Setting the  parameter `name` allows multiple notifiers to be created. The notifier will bind to the service `notify.NOTIFIER_NAME`.
+- **resource** (*Required*): The incoming webhook URL.
+
+To use notifications, please see the [getting started with automation page](/getting-started/automation/).