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

apps/time_entries/admin.py

@@ -0,0 +1,33 @@
+from django.contrib import admin
+
+from core.admins.base import BaseAdmin, SoftDeleteListFilter
+from apps.time_entries.models import TimeEntry
+
+
+@admin.register(TimeEntry)
+class TimeEntryAdmin(BaseAdmin):
+    list_display = (
+        "id",
+        "user",
+        "workspace",
+        "project",
+        "start_time",
+        "end_time",
+        "is_billable",
+    )
+    list_filter = (
+        SoftDeleteListFilter,
+        "workspace",
+        "project",
+        "is_billable",
+    )
+    search_fields = (
+        "user__mobile",
+        "project__name",
+        "description",
+    )
+    autocomplete_fields = (
+        "user",
+        "workspace",
+        "project",
+    )