Update readme

Author: r57zone

README.md

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 [![EN](https://user-images.githubusercontent.com/9499881/33184537-7be87e86-d096-11e7-89bb-f3286f752bc6.png)](https://github.com/r57zone/OpenVR-ArduinoHMD/blob/master/README.md) 
 [![RU](https://user-images.githubusercontent.com/9499881/27683795-5b0fbac6-5cd8-11e7-929c-057833e01fb1.png)](https://github.com/r57zone/OpenVR-ArduinoHMD/blob/master/README.RU.md) 
+← Choose language | Выберите язык
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 # OpenVR Arduino HMD
 Driver for OpenVR / SteamVR, which allows to track the head, using any Arduino rotation tracker, for a DIY VR HMD from [HDMI display](http://alii.pub/65dbii) and [headset](http://alii.pub/65dct6).<br>
 <br>![](https://user-images.githubusercontent.com/9499881/126820737-5a8f3c5b-f723-4184-94d8-5031f52f2270.gif)