Add VeSync documentation and image (#4864)

* Add VeSync documentation and image

* Adds fix for TravisCI error endconfiguration

* ✏️ Tiny updates

source/_components/switch.vesync.markdown

@@ -0,0 +1,36 @@
+---
+layout: page
+title: "VeSync Switch"
+description: "Instructions on how to set up Etekcity VeSync switches within Home Assistant."
+date: 2018-03-09 02:11
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: vesync.png
+ha_category: Switch
+ha_release: 0.66
+---
+
+The `vesync` switch platform enabled integration with Etekcity VeSync smart switches.
+
+To use your VeSync switches, you must first register your switches with the VeSync app. Once registration is complete you must add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+switch:
+  - platform: vesync
+    username: username
+    password: password
+```
+
+{% configuration %}
+username:
+  description: Username needed to log in to VeSync.
+  required: true
+  type: string
+password:
+  description: Password needed to log in to VeSync.
+  required: true
+  type: string
+{% endconfiguration %}