update(9key): Add readme with updated format

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+9key
+===
+
+![9key](http://i.imgur.com/a3wWc7h.jpg)
+![9KeyBehind](http://i.imgur.com/2PWf5wu.jpg)
+
+A compact minipad (3x3) keyboard made and sold by Bishop Keyboards.
+
+Keyboard Maintainer: [Bishop Keyboards](https://www.reddit.com/user/se7en9057) (BishopKeyboards.com under renovation)  
+Hardware Supported: 9key PCB, Pro Micro ATmega32U4
+Hardware Availability: [BishopKeyboards.com](https://www.reddit.com/user/se7en9057) (BishopKeyboards.com under renovation)  
+
+Make example for this keyboard (after setting up your build environment):
+
+    make 9key-default
+
+See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
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