Update README.md

Author: crosby-moe

README.md

@@ -2,6 +2,13 @@
 
 A Legacy Fabric adapter for the Spark performance profiler.
 
+## To-do List
+
+- [ ] Command functionality (probably make brigadier commands work in legacy fabric 1.8.9)
+- [ ] Figure out data pack & resource pack polling
+- [ ] Test whether gamerules can be queried from the client
+- [ ] Test text serialization (see `LegacyFabricServerCommandSender` line 54)
+
 ## License
 
 Astraea Spark is a fork of [spark-fabric](https://github.com/lucko/spark/tree/master/spark-fabric) licensed under the [GNU GPLv3 license](./LICENSE).