Add TODO file, minor fixes

TODO.md

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+# TODO
+
+- Better organize code
+- Resolve TODOs in code
+- Don't drop errors, handle everywhere where needed (some were dropped while
+  prototyping to speed up development)
+
+## Nice to have
+
+- Console error if server already started on port, not through `lazymc`
+- Kick with message if proxy-to-server connection fails for new client. 
+- Test configuration on start (server dir exists, command not empty)
+- Also quit `lazymc` after CTRL+C signal, after server has stopped
+- Dynamically increase/decrease server polling interval based on server state
+- Server polling through query (`enable-query` in `server.properties`, uses GameSpy4 protocol)
+
+## Experiment
+
+- Lobby method: let players connect with an emulated empty server (like 2b2t's
+  queue), redirect them when the server started.
+- `io_uring` on Linux for efficient proxying (see `tokio-uring`)