Add: base for user api app

backend/api/user/admin.py

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+from django.contrib import admin
+

backend/api/user/apps.py

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+from django.apps import AppConfig
+
+
+class UserConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "api.user"

backend/api/user/models.py

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+from django.db import models
+

backend/api/user/tests.py

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+from django.test import TestCase
+
+# Create your tests here.