implemented basic layout & functionality for add group button & group tiles

lib/presentation/widgets/group_tile.dart

@@ -0,0 +1,56 @@
+import 'package:flutter/material.dart';
+//import 'package:game_tracker/data/dto/group.dart';
+
+class Group {
+  final String id;
+  final String name;
+  final List<Player> members;
+
+  Group({required this.id, required this.name, required this.members});
+}
+
+class Player {
+  final String id;
+  final String name;
+
+  Player({required this.id, required this.name});
+}
+
+class GroupTile extends StatelessWidget {
+  const GroupTile({super.key, required this.group});
+
+  final Group group;
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      child: Column(
+        children: [
+          Row(
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            children: [
+              Text("${group.name}", overflow: TextOverflow.ellipsis),
+              Text("${group.members.length}"),
+              Icon(Icons.group),
+            ],
+          ),
+          Wrap(
+            spacing: 8.0,
+            runSpacing: -4.0,
+            children: <Widget>[
+              for (var member in group.members)
+                Container(
+                  color: Colors.grey,
+                  padding: const EdgeInsets.all(4.0),
+                  decoration: BoxDecoration(
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  child: Text(member.name),
+                ),
+            ],
+          ),
+        ],
+      ),
+    );
+  }
+}