Add TODO.md

TODO.md

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+# Todo list 
+
+Score fetching:
+- Fetch and store all scores from the websocket
+- Update every players scores every week so we can ensure we have every score stored. (last 20 pages?)
+
+BeatSaver data:
+- API Route: "/beatsaver/maps?hashes=id1,id2, etc"
+- Fetch map data from their api if we haven't already cached it. Cached maps should last for a week or 2 (longer if ranked?)