Add more engine update info in readme and changelog

CHANGELOG.md

@@ -11,11 +11,15 @@
   * Currently `chesskit-engine` assumes `192x15_network` is available in your app's `Bundle.main`.
   * Network files can be downloaded from [lczero.org](https://lczero.org/play/bestnets/).
   * Any other files can be added via `.setoption(id:value:)` engine commands.
+  * Currently there are some performance issues using `lc0` in an app; this is being investigated but any contributions (via PRs or issues) are appreciated.
 
 #### Improvements
 * `Engine.start()` now takes a `completion` handler.
   * This is called once the engine has finished initializing.
   * Engine commands (i.e. setting options or requesting evaluations) should not be sent until this completion handler is called.
+* `EngineMessenger` now sends commands to the engines via `stdin`, see [Issue #11](https://github.com/chesskit-app/chesskit-engine/issues/11).
+  * This will allow for much simpler upgrades to existing engines, as well as the inclusion of new engines in the future.
+  * Special thanks [@dehlen](https://github.com/dehlen).
 
 # ChessKitEngine 0.3.0
 Released Wednesday, March 27, 2024.

README.md

@@ -109,8 +109,9 @@ engine.loggingEnabled = true
 
 ## Neural Networks
 Both `Stockfish 16.1` and `LeelaChessZero 0.30` require neural network files to be provided to the engine for computation.
+In order to keep the package size small and allow for the greatest level of flexibility, these neural network files are **not** bundled with the package. Therefore they must be added to the app (either in the bundle or manually by a user) and then provided to the engine at runtime.
 
-They can be provided to the engine using the `.setoption(id:value:)` UCI commands provided by `chesskit-engine`.
+They can be provided to the engine using the `.setoption(id:value:)` UCI commands included in `chesskit-engine`.
 
 For example:
 ``` swift
@@ -130,6 +131,7 @@ The following details the recommended files for each engine and where to obtain
 * Other files from https://tests.stockfishchess.org can be used if desired.
 
 #### LeelaChessZero
+⚠️ There are currently some performance issues with lc0 in `chesskit-engine` ([PR's are welcome!](https://github.com/chesskit-app/chesskit-engine/compare)).
 * `"WeightsFile"`: `192x15_network` ([download here](https://github.com/chesskit-app/chesskit-engine/tree/0f11891b3c053e12d04c2e9c9d294c4404b006c3/Tests/ChessKitEngineTests/EngineTests/Resources))
 * Other files can be obtained [here](https://lczero.org/play/bestnets/) or [here](https://training.lczero.org/networks/).