move kontor_model in kontor-api (#98)

Co-authored-by: Thomas Peetz <thomas.peetz@cimt-ag.de>
Reviewed-on: #98

kontor-api/src/schema/bookshelf/author.py

@@ -0,0 +1,25 @@
+from datetime import datetime
+
+from pydantic import BaseModel
+
+from src.db.models.bookshelf import Author
+
+
+class AuthorResponse(BaseModel):
+    id: str
+    created_date: datetime
+    last_modified_date: datetime
+    version: int
+    first_name: str
+    last_name: str
+
+def to_response(author:  Author) -> AuthorResponse:
+    response: AuthorResponse = AuthorResponse(
+            id=author.id,
+            created_date=author.created_date,
+            last_modified_date=author.last_modified_date,
+            version=author.version,
+            first_name=str(author.first_name),
+            last_name=str(author.last_name)
+    )
+    return response