add score table

lib/data/db/tables/score_table.dart

@@ -0,0 +1,16 @@
+import 'package:drift/drift.dart';
+import 'package:game_tracker/data/db/tables/match_table.dart';
+import 'package:game_tracker/data/db/tables/player_table.dart';
+
+class ScoreTable extends Table {
+  TextColumn get playerId =>
+      text().references(PlayerTable, #id, onDelete: KeyAction.cascade)();
+  TextColumn get matchId =>
+      text().references(MatchTable, #id, onDelete: KeyAction.cascade)();
+  IntColumn get roundNumber => integer()();
+  IntColumn get score => integer()();
+  IntColumn get change => integer()();
+
+  @override
+  Set<Column<Object>> get primaryKey => {playerId, matchId, roundNumber};
+}