Added documentation for gogogate2 (#5023)

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source/_components/cover.gogogate2.markdown

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+---
+layout: page
+title: "Gogogate2 Cover"
+description: "Instructions on how to integrate Gogogate2-Enabled garage door covers into Home Assistant."
+date: 2018-03-26 20:02
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: gogogate2.png
+ha_category: Cover
+ha_release: 0.67
+ha_iot_class: Local Polling
+---
+
+The `gogogate2` cover platform lets you control Gogogate2-Enabled garage doors through Home Assistant. Device names in Home Assistant are generated based on the names defined in your Gogogate2 mobile app.
+
+## {% linkable_title Configuration %}
+
+To use your Gogogate2 cover in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yml entry
+cover:
+  - platform: gogogate2
+    username: email@email.com
+    password: password
+    ip_address: 192.168.1.200
+```
+
+{% configuration %}
+username:
+  description: Your Gogogate2 account username.
+  required: true
+  type: string
+password:
+  description: Your Gogogate2 account password.
+  required: true
+  type: string
+ip_address:
+  description: The IP Address of your Gogogate2 device.
+  required: true
+  type: string
+name:
+  description: Allows you to override the default name.
+  default: gogogate2
+  required: false
+  type: string
+{% endconfiguration %}