feat: add ai castling (Fixes #4)

app/src/main/java/chess/ai/actions/AIActionCastling.java

@@ -0,0 +1,20 @@
+package chess.ai.actions;
+
+import chess.controller.CommandExecutor;
+import chess.controller.commands.CastlingCommand;
+
+public class AIActionCastling extends AIAction{
+
+	private final boolean bigCastling;
+
+	public AIActionCastling(CommandExecutor commandExecutor, boolean bigCastling) {
+		super(commandExecutor);
+		this.bigCastling = bigCastling;
+	}
+
+	@Override
+	public void applyAction(CommandExecutor commandExecutor) {
+		sendCommand(new CastlingCommand(this.bigCastling), commandExecutor);
+	}
+	
+}