add new Controller to redirect

src/main/java/mops/gruppen2/controller/MopsController.java

@@ -0,0 +1,13 @@
+package mops.gruppen2.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+
+@Controller
+public class MopsController {
+
+    @GetMapping("")
+    public String redirect(){
+        return "redirect:/gruppen2/";
+    }
+}