Move apps in main directory

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

api/viewsets.py

@@ -0,0 +1,20 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.contrib.auth.models import User
+from django_filters.rest_framework import DjangoFilterBackend
+from rest_framework.filters import SearchFilter
+from rest_framework.viewsets import ModelViewSet
+
+from .serializers import UserSerializer
+
+
+class UserViewSet(ModelViewSet):
+    """
+    Display list of users.
+    """
+    queryset = User.objects.order_by("id").all()
+    serializer_class = UserSerializer
+    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filterset_fields = ['id', 'first_name', 'last_name', 'email', 'is_superuser', 'is_staff', 'is_active', ]
+    search_fields = ['$first_name', '$last_name', ]