Create roomtypes.md

docs/roomtypes.md

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+# Room Types
+Room Types (in the `roomtype` object layer) affect how the camera scrolls. This is used to create long or large rooms that span multiple minimap tiles in the game.
+
+### Room types:
+```
+0: no camera
+1: single room, no scroll
+2: horizontal room
+3: vertical room
+4: free camera room (can be used for horizontal, vertical, or open room)
+5: map transition room (draws an arrow in the minimap, connects with horizontal rooms)
+-1, -2: not sure yet
+```