Update README.md

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Jarno Lehtinen 2017-09-25 19:02:46 +03:00 committed by GitHub
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![X-Arcade](https://github.com/mcgurk/Arduino-USB-HID-RetroJoystickAdapter/raw/master/Images/x-arcade-dual-joystick.jpg)
```
D9-connector -> Arduino
D9-connector -> Arduino Pro Micro
5 -> 3 (clk)
6 -> 4 (data)
1 -> Vcc (5V)
2 -> Vcc (PS/2-mode)
9 -> Vcc (5V)
Shield -> GND
Or
PS/2 -> Arduino Pro Micro
Data (green or blue) -> 3
CLK (white or purple) -> 2
5V (red) -> 5V
GND (black) -> GND
```
#### Library
PS2KeyRaw