add game table

lib/data/db/tables/game_table.dart

@@ -0,0 +1,14 @@
+import 'package:drift/drift.dart';
+
+class GameTable extends Table {
+  TextColumn get id => text()();
+  TextColumn get name => text()();
+  TextColumn get ruleset => text()();
+  TextColumn get description => text().nullable()();
+  TextColumn get color => text().nullable()();
+  TextColumn get icon => text().nullable()();
+  DateTimeColumn get createdAt => dateTime()();
+
+  @override
+  Set<Column<Object>> get primaryKey => {id};
+}