Add Tuya cover and scene document (#5840)

* Add Tuya cover and scene document

* fix as required

source/_components/cover.tuya.markdown

@@ -0,0 +1,23 @@
+---
+layout: page
+title: "Tuya Cover"
+description: "Instructions on how to setup the Tuya cover within Home Assistant."
+date: 2018-07-20 09:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: tuya.png
+ha_category: Cover
+ha_iot_class: "Cloud Polling"
+ha_release: 0.75
+---
+
+
+The `tuya` cover platform allows you to control your [Tuya Smart](https://www.tuya.com) curtains.
+
+The platform supports curtains.
+
+<p class='note'>
+Full configuration details can be found on the main [Tuya component](/components/tuya/) page.
+</p>

source/_components/scene.tuya.markdown

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+---
+layout: page
+title: "Tuya Scene"
+description: "Instructions on how to setup the Tuya scene within Home Assistant."
+date: 2018-07-20 09:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: tuya.png
+ha_category: Scene
+ha_release: 0.75
+---
+
+
+The `tuya` scene platform allows you to activate your [Tuya Smart](https://www.tuya.com) scenes.
+
+The platform supports scenes.
+
+The device state in frontend panel will not change immediately after you activate a scene.
+
+<p class='note'>
+Full configuration details can be found on the main [Tuya component](/components/tuya/) page.
+</p>