Add marshmallow-sqlalchemy doc ref URL

Author: khteh

src/models/AuthorModel.py

@@ -12,6 +12,7 @@
 class AuthorModel(Base):
     """
     Author Model
+    https://marshmallow-sqlalchemy.readthedocs.io/en/latest/
     """
     __tablename__ = 'authors'
     id: Mapped[int] = mapped_column(Integer, primary_key=True)

src/models/BookModel.py

@@ -10,6 +10,7 @@
 class BookModel(Base):
     """
     Book Model
+    https://marshmallow-sqlalchemy.readthedocs.io/en/latest/
     """
     __tablename__ = "books"
     id: Mapped[int] = mapped_column(Integer, primary_key=True)

src/models/UserModel.py

@@ -10,6 +10,7 @@
 class UserModel(Base):
     """
     User Model
+    https://marshmallow-sqlalchemy.readthedocs.io/en/latest/
     """
     __tablename__ = 'users'
     id: Mapped[int] = mapped_column(Integer, primary_key=True)