Added new default error page

src/main/java/com/example/clientproject/web/controllers/Throw500.java

+package com.example.clientproject.web.controllers;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+
+@Controller
+public class Throw500 {
+
+    @GetMapping("/return500")
+    public String throw500(){
+
+        return "index.html";
+
+    }
+}