cohost re-implementation on atprotocol

Create TODO.md

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TODO.md
··· 1 + # TODO for AThost implementation 2 + 3 + this is my wonderful little sheet of things that i need to do for this project :p 4 + 5 + [bryan's github on this issue](https://github.com/bluesky-social/atproto/discussions/2961) 6 + 7 + --- 8 + 9 + ## early stage stuff for creating an appview: 10 + 11 + ### accounts and identities 12 + - resolve and validate identities (handle and DID), include a caching layer 13 + - keeping track of account state (activate, deleted, deactivated, etc.) 14 + - consume account and identity events from the firehose and update status as needed 15 + 16 + some notes: 17 + - need to think more about account deletion/deactivation and how to handle it in a way that makes sense - do users want to delete their entire atproto account (likely not). so restricting this sort of record creation to *within* athost makes more sense, but it needs to make sense. 18 + 19 + TODO EVEN MORE BUT THIS IS GOOD FOR NOW IG LOL