Add a tetris keymap to clueboard that includes a tetris game

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+Default layout but with a tetris game
+=====================================
+Tetris works by outputting key-presses to make ascii-art in a regular text editor.
+It reads key presses to rotate and move the bricks like a regular tetris game.
+
+Example
+=======
+![tetris](https://raw.githubusercontent.com/danamlund/meckb_tetris/master/tetris.gif)
+
+Usage
+=====
+1) Open a default text editor
+2) Press the tetris button (Fn + t)
+3) Play tetris
+
+It makes ascii-art by sending keycodes: left, right, up, down, qwerty characters, and numbers.
+
+Problems
+========
+Drawing ascii-art is too slow to make a pleasant playing experience.
+While drawing ascii-art, the keyboard does not record key-presses, so its pretty unresponsive.
+
+Adds 5000 bytes to the hex file.
+
+Implement in other keyboards
+============================
+ - Copy-paste the files tetris_text.c and tetrix_text.h to your keymap folder.
+ - Add/update your-keyboard/your-keymap/Makefile to include ``SRC = tetris_text.c``
+ - Copy-paste the tetris-related code from this keymap.c to yours.
+ - Set a key to trigger F(1) to start tetris mode.
+ - Its also a good idea to set a key to stop tetris, here its escape.
+
+You can find a simple tetris keyboard definition at <https://github.com/danamlund/meckb_tetris/>