Initial commit with gitignore

lib/state/player_pool.dart

@@ -0,0 +1,11 @@
+import '../models/player.dart';
+
+class PlayerPool {
+  final List<Player> players;
+
+  PlayerPool({List<Player>? players}) : players = players ?? [];
+
+  void add(Player p) => players.add(p);
+  void removeAt(int index) => players.removeAt(index);
+  void clear() => players.clear();
+}