Rewrite readme

keyboards/bankair/schlagpad/readme.md

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-9key
+Schlagpad
 ===
 
-![9key](http://i.imgur.com/a3wWc7h.jpg)
-![9KeyBehind](http://i.imgur.com/2PWf5wu.jpg)
+The schlagpad is a minimalist keyboard with a 3x3 matrix.
 
-A compact minipad (3x3) keyboard made and sold by Bishop Keyboards.
-
-Keyboard Maintainer: QMK Community  
-Hardware Supported: 9key PCB, Pro Micro ATmega32U4  
-Hardware Availability: [BishopKeyboards.com](http://bishopkeyboards.com/)
-
-Make example for this keyboard (after setting up your build environment):
-
-    make 9key:default
-
-See [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) then the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information.
+It's not designed to be a fancy keyboard. Main goal was to learn how to make a keyboard from scratch (PCB, assembly, firmware, etc.).