add back marshmallow

src/schemas.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+from marshmallow import Schema, fields
+
+
+"""
+Schemas of input objects
+"""
+
+
+__author__ = "@tormakris"
+__copyright__ = "Copyright 2020, Birbnetes Team"
+__module_name__ = "schemas"
+__version__text__ = "1"
+
+
+class SampleSchema(Schema):
+    """ /v1/email/pay - POST
+
+    Parameters:
+     - date (date)
+     - device_id (str)
+    """
+
+    date = fields.Date(required=True)
+    device_id = fields.Str(required=True)