Add image of the prototype hub.

README.md

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 4 Port high power USB hub 
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+![Prototype version of USB hub](https://raw.githubusercontent.com/dilshan/usb2-power-hub/master/resource/usb-power-hub-prototype.jpg)
 
 This project is about a high current USB 2.0 hub that is specifically designed to drive USB powered development boards and experimental peripherals.
 
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 This USB hub uses *PIC16F630* MCU and four units of *LM2596-5.0* switching regulators to achieve the above-listed features. 
 
 This project is an open-source hardware project. All the documentation, design files, firmware source codes, and binaries are available at this github repository.
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