repo: add Roadmap Notes

TODO.md

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+# TODO
+## Avoid Split-Brain
+- [x] Broadcast `time_created` for servers
+- [ ] Create thread that always looks for older server to join
+
+## Remain Connected
+- [ ] Create thread that checks if Connector is connected
+- [ ] Fire up Connector initialization on Disconnect
+- [ ] Fire up Server initialization if server disappeared and `create: needed`
+
+## Eventhive APIs
+- [ ] Create a default configuration to launch with Service Discovery
+- [ ] Make `init` return what was finally initialized
+- [x] Make `init` accept parameters of `required` connectors - failing if they cannot get initialized
+- [ ] Make a `run_forever` function, avoid `while True` looping after `eventhive.init`
+- [x] Make `hook` also `append` events in case they are not created
+- [x] Create a `register(event, function)` function to assign any event to any function
+- [ ] Create a response system to `eventhive.EVENTS.call`
+- [ ] Create a way to not receive Events sent by the same process
+
+## Backends
+- [ ] RabbitMQ PubSub
+- [ ] AWS SNS
+- [ ] Google PubSub
+- [ ] Kafka
+
+## Security
+- [ ] Split Signing and Encryption functionality
+- [x] Add signing to broadcast - if `secret` is set in server
+- [ ] Create a way to reject replayed messages (using the Event UUIDs with an LRU cache?)
+
+## Support Python object passing
+- [ ] Use `marshal`/`pickle` to values that are not JSON serializable
+- [ ] Only allow the above if `secret` is set, for Security Reasons (RCE if plaintext)
+
+## Documentation
+- [ ] Create smaller examples
+- [ ] Create RTFD page
+- [ ] Create an example using render.com Free plan's Redis
+
+## Reliability
+- [ ] Create a threaded producer/consumer model (a queue?) for events going to `publish` (in `send_to_pubsub`),
+so they are not lost if Connector doesn't work (`publish` fails)
+- [ ] Properly use `async` wherever needed/supported by libraries