Move django-based uncloud to top-level

uncloud_auth/serializers.py

@@ -0,0 +1,16 @@
+from django.contrib.auth import get_user_model
+from rest_framework import serializers
+
+from uncloud import AMOUNT_DECIMALS, AMOUNT_MAX_DIGITS
+
+class UserSerializer(serializers.ModelSerializer):
+
+    balance = serializers.DecimalField(max_digits=AMOUNT_MAX_DIGITS,
+                                       decimal_places=AMOUNT_DECIMALS)
+
+    class Meta:
+        model = get_user_model()
+        fields = ['username', 'email', 'balance', 'maximum_credit' ]
+
+class ImportUserSerializer(serializers.Serializer):
+    username = serializers.CharField()