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

rest_api/app/services/file/i_file.py

@@ -0,0 +1,13 @@
+from fastapi import UploadFile
+from abc import ABCMeta, abstractmethod
+from schemas.file_properties import FileProperties
+
+
+class FileService:
+    __metaclass__ = ABCMeta
+
+    @abstractmethod
+    def upload(file_properties: FileProperties, file: UploadFile): raise NotImplementedError
+
+    @abstractmethod
+    def download(file_properties: FileProperties): raise NotImplementedError