Add API endpoint to get volunteers names and emails, for tournament organizers only, to easily add juries

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

registration/api/serializers.py

@@ -1,6 +1,7 @@
 # Copyright (C) 2020 by Animath
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from django.contrib.auth.models import User
 from rest_framework import serializers
 from rest_polymorphic.serializers import PolymorphicSerializer
 
@@ -44,3 +45,9 @@ class PaymentSerializer(serializers.ModelSerializer):
     class Meta:
         model = Payment
         fields = '__all__'
+
+
+class BasicUserSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = User
+        fields = ['first_name', 'last_name', 'email', ]