core: use rest_framework in accounts

accounts/serializers/login.py

@@ -0,0 +1,12 @@
+from rest_framework.serializers import Serializer, CharField
+from django.contrib.auth import authenticate
+from django.core.exceptions import ValidationError
+
+class LoginSerializer(Serializer):
+    
+	username = CharField()
+	password = CharField()
+
+	def get_user(self, data):
+		user = authenticate(username=data['username'], password=data['password'])
+		return user