feat(time_entries): add time_entries app's basic structure and endpoints

apps/time_entries/api/urls.py

@@ -0,0 +1,13 @@
+from django.urls import path, include
+from rest_framework.routers import DefaultRouter
+
+from apps.time_entries.api.views import TimeEntryViewSet
+
+app_name = "time_entries"
+
+router = DefaultRouter()
+router.register(r"time-entries", TimeEntryViewSet, basename="time-entry")
+
+urlpatterns = [
+    path("", include(router.urls)),
+]