[New Feature] Rest API implementation to showcase the OpenDBM features

rest_api/app/schemas/user.py

@@ -0,0 +1,11 @@
+from pydantic import BaseModel
+from typing import Union
+
+class User(BaseModel):
+    username: str
+    email: Union[str, None] = None
+    full_name: Union[str, None] = None
+    disabled: Union[bool, None] = None
+
+class UserInDB(User):
+    hashed_password: str