feat(clients): add clients app basic structure and endpoints

apps/clients/api/urls.py

@@ -0,0 +1,12 @@
+from django.urls import path, include
+from rest_framework.routers import DefaultRouter
+
+from apps.clients.api.views import ClientViewSet
+
+
+router = DefaultRouter()
+router.register(r"clients", ClientViewSet, basename="client")
+
+urlpatterns = [
+    path("", include(router.urls)),
+]