fix register page submit button. Check duplicated user register. Fix typo in register page.Add Marking seeder.

app/Http/Controllers/Auth/RegisterController.php

@@ -46,7 +46,6 @@ class RegisterController extends Controller
     protected function validator(array $data)
     {
         return Validator::make($data, [
-            'name' => 'required|max:255',
             'email' => 'required|email|max:255|unique:users',
             'password' => 'required|min:6|confirmed',
         ]);
@@ -67,14 +66,17 @@ class RegisterController extends Controller
         if($marking->marking != $data['marking']){
             return response()->json('Wrong Marking', 400);   
         }
+        if(User::Where('email',$data['email'])->first()){
+            return response()->json('Dulpicated user', 401);      
+        }
         
         $role = Role::where('name','=','member')->first();
         $user = new User();
         $user->email = $data['email'];
         $user->password = bcrypt($data['password']);
+
         $user->save();
         $user->attachRole($role);
-
         return response()->json($user, 201);   
     }
 }