add schemas

src/schemas/loan.py

@@ -0,0 +1,14 @@
+from .book import Book
+from dataclasses import dataclass
+
+
+@dataclass
+class Loan:
+    id: int
+    user_id: int
+    media_id: int
+    loan_date: str
+    return_date: str
+    returned: int
+    returned_date: str
+    book: Book