Beaglebone Black GPIO docs (#1765)

* Fix typo

* Add initial docs for Beaglebone Black

* Fix name

source/_components/bbb_gpio.markdown

@@ -0,0 +1,16 @@
+---
+layout: page
+title: "BeagleBone Black GPIO"
+description: "Instructions how to integrate the GPIO capability of a BeagleBone Black into Home Assistant."
+date: 2017-01-14 10:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: beaglebone-black.png
+ha_category: DIY
+ha_release: 0.36
+---
+
+The `bbb_gpio` component is the base for all [BeagleBone Black][https://beagleboard.org/black] related GPIO platforms in Home Assistant. There is no setup needed for the component itself, for the platforms please check their corresponding pages.
+

source/_components/switch.bbb_gpio.markdown

@@ -0,0 +1,41 @@
+---
+layout: page
+title: "BeagleBone Black GPIO Switch"
+description: "Instructions how to integrate the GPIO of a BeagleBone Black into Home Assistant as a switch."
+date: 2017-01-14 10:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: beaglebone-black.png
+ha_category: Switch
+ha_release: 0.36
+---
+
+The `bbb_gpio` switch platform allows you to control the GPIOs of your [BeagleBone Black](https://beagleboard.org/black).
+
+To use yourBeagleBone Black's GPIO in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+switch:
+ - platform: bbb_gpio
+   pins:
+     GPIO0_7:
+       name: LED Red
+     P9_12:
+       name: LED Green
+       initial: true
+       invert_logic: true
+```
+
+Configuration variables:
+
+- **pins** array (*Required*): Array of used ports.
+  - **pin_name** (*Required*): Port numbers and corresponding names.
+    - **name** (*Optional*): Friendly name to use for the frontend.
+    - **initial** (*Optional*): Initial state of the pin. Defaults to `False`.
+    - **invert_logic** (*Optional*): If true, inverts the output logic to ACTIVE LOW. Default is `false` (ACTIVE HIGH).
+
+For more details about the GPIO layout, visit the [article](http://elinux.org/Beagleboard:BeagleBoneBlack) about the BeagleBone Black.
+