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

lib/presentation/views/main_menu/groups_view.dart

@@ -1,10 +1,86 @@
-import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+//import 'package:game_tracker/data/dto/group.dart';
+//import 'package:game_tracker/data/dto/player.dart';
+import 'package:game_tracker/presentation/widgets/full_width_button.dart';
+import 'package:game_tracker/presentation/widgets/group_tile.dart';
+import 'package:game_tracker/presentation/widgets/top_centered_message.dart';
 
-class GroupsView extends StatelessWidget {
+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 GroupsView extends StatefulWidget {
   const GroupsView({super.key});
 
+  @override
+  State<GroupsView> createState() => _GroupsViewState();
+}
+
+class _GroupsViewState extends State<GroupsView> {
+  Future<List<Group>> _getMockGroups() async {
+    await Future.delayed(const Duration(seconds: 1));
+    final player1 = Player(id: 'p1', name: 'Felix');
+    final player2 = Player(id: 'p2', name: 'Yannick');
+    final player3 = Player(id: 'p3', name: 'Mathis');
+    final player4 = Player(id: 'p4', name: 'Petrus');
+
+    return [
+      Group(
+        id: 'g1',
+        name: 'Weekend Warriors',
+        members: [player1, player2, player4],
+      ),
+      Group(id: 'g2', name: 'Strategy Masters', members: [player3, player4]),
+      Group(
+        id: 'g3',
+        name: 'The Cardboard Crew',
+        members: [player1, player2, player3, player4],
+      ),
+      Group(id: 'g4', name: 'The Group', members: [player1, player3, player4]),
+    ];
+  }
+
   @override
   Widget build(BuildContext context) {
-    return const Center(child: Text('Groups View'));
+    return Column(
+      children: [
+        FutureBuilder(
+          future: _getMockGroups(),
+          builder: (BuildContext context, AsyncSnapshot<List<Group>> snapshot) {
+            if (snapshot.connectionState == ConnectionState.waiting) {
+              return Center(
+                child: TopCenteredMessage(
+                  message: "Data not yet available, show sceleton",
+                ),
+              );
+            } else if (snapshot.hasError) {
+              return Center(
+                child: TopCenteredMessage(
+                  message: "Error while loading group data.",
+                ),
+              );
+            } else if (!snapshot.hasData || snapshot.data!.isEmpty) {
+              return Center(
+                child: TopCenteredMessage(message: "No groups created yet."),
+              );
+            }
+            return GroupTile(group: snapshot.data![0]);
+            //return ListView.builder()
+          },
+        ),
+        FullWidthButton(text: "Create Group", onPressed: () {}),
+      ],
+    );
   }
 }