Add spider power plug component (#5892)

* Add spider power plug component

* added scan_interval to optional configuration

* ✏️ Minor tweaks

source/_components/spider.markdown

@@ -34,6 +34,10 @@ password:
   description: Account password of mijn.ithodaalderop.nl
   required: true
   type: string
+scan_interval:
+  description: How frequently to query for new data. Defaults to 120 seconds.
+  required: false
+  type: int
 {% endconfiguration %}
 
 <p class='note warning'>

source/_components/switch.spider.markdown

@@ -0,0 +1,24 @@
+---
+layout: page
+title: "Spider Power Plug"
+description: "Instructions on how to integrate Spider power plugs within Home Assistant."
+date: 2018-07-26 22:01
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: spider.png
+ha_category: Switch
+ha_iot_class: "Cloud Polling"
+ha_release: 0.75
+---
+
+The `spider` power plug platform allows you to control your power plugs. It also shows you your current and daily energy usage by the power plug.
+
+<p class='note'>
+Full configuration details can be found on the main [Spider component](/components/spider/) page.
+</p>
+
+<p class='note warning'>
+This component is not affiliated with Itho Daalderop Spider and retrieves data from the endpoints of the mobile application. Use at your own risk.
+</p>