Added basic Marianum Message and Roomplan in more section

lib/screen/pages/more/roomplan/roomplan.dart

@@ -1,10 +1,23 @@
 import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
 
 class Roomplan extends StatelessWidget {
   const Roomplan({Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
-    return const Text("asd");
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("Raumplan"),
+      ),
+      backgroundColor: Colors.white,
+      body: InteractiveViewer(
+        panEnabled: true,
+        alignment: Alignment.center,
+        minScale: 0.8,
+        maxScale: 2,
+        child: Image.asset("assets/img/raumplan.jpg")
+      ),
+    );
   }
 }