cleanup

to do.md

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+# To Do List
+## What features/functions do I need?
+* save (autosave)
+* load
+* 2x 2D arrays: possible moves and positions
+* check if move is allowed (vertical, etc.)
+* check if another piece or rule blocks movement
+* "special" rules
+* switch between players
+* check if position is out of boundaries
+* TUI using ASCII
+*