♻️ add root layout with navbar

create root directory for page that will use navbar and other basic elements

app/(main)/layout.tsx

@@ -0,0 +1,13 @@
+import NavbarUI from "@/shared/ui/navbar";
+import React from "react";
+
+const mainLayout = ({ children }: Readonly<{ children: React.ReactNode }>) => {
+  return (
+    <div>
+      <NavbarUI />
+      <main>{children}</main>
+    </div>
+  );
+};
+
+export default mainLayout;