Move django-based uncloud to top-level

uncloud_storage/admin.py

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+from django.contrib import admin
+
+# Register your models here.

uncloud_storage/apps.py

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+from django.apps import AppConfig
+
+
+class UncloudStorageConfig(AppConfig):
+    name = 'uncloud_storage'

uncloud_storage/models.py

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+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+
+class StorageClass(models.TextChoices):
+    HDD          = 'HDD', _('HDD')
+    SSD          = 'SSD', _('SSD')

uncloud_storage/tests.py

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

uncloud_storage/views.py

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+from django.shortcuts import render
+
+# Create your views here.