Add Homepage and Settings Page with theme Selector

frontend_splatournament_manager/lib/homepage.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+
+class Homepage extends StatelessWidget {
+  const Homepage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("Splatournament"),
+        actions: [
+          PopupMenuButton(
+            onSelected: (value) {
+              context.go("/settings");
+            },
+            itemBuilder: (context) {
+              return [PopupMenuItem(value: 1,child: Text("Settings"),)];
+            },
+          ),
+        ],
+      ),
+      body: Center(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [Text("Homepage")],
+        ),
+      ),
+    );
+  }
+}