Add TODO

TODO.md

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+# TODO
+
+## Architecture
+
+- Move dialogue- and option-drawing out of `Game.hx`
+
+## Features
+
+- Saving and loading games
+- Character select
+- Stats
+- Better open / closed state graphics for rooms
+- Displaying sprites (characters, objects)
+- Inventory
+- Room labels
+
+### Dialogue
+
+- Text formatting
+- Character profiles / speaker ID