Added the documentation.

docs/source/examples.rst

@@ -0,0 +1,61 @@
+Examples
+========
+
+
+.. _example-userutils:
+
+An Example Configuration
+------------------------
+
+The following is an example configuration for *Mia! Accounting*.
+
+::
+
+    from flask import Response, redirect
+    from .auth import current_user()
+    from .modules import User
+
+    def create_app(test_config=None) -> Flask:
+        app: Flask = Flask(__name__)
+
+        ... (Configuration of SQLAlchemy, CSRF, Babel_JS, ... etc) ...
+
+        import accounting
+
+        class UserUtilities(accounting.UserUtilityInterface[User]):
+
+            def can_view(self) -> bool:
+                return True
+
+            def can_edit(self) -> bool:
+                return "editor" in current_user().roles
+
+            def can_admin(self) -> bool:
+                return current_user().is_admin
+
+            def unauthorized(self) -> Response:
+                return redirect("/login")
+
+            @property
+            def cls(self) -> t.Type[User]:
+                return User
+
+            @property
+            def pk_column(self) -> Column:
+                return User.id
+
+            @property
+            def current_user(self) -> User | None:
+                return current_user()
+
+            def get_by_username(self, username: str) -> User | None:
+                return User.query.filter(User.username == username).first()
+
+            def get_pk(self, user: User) -> int:
+                return user.id
+
+        accounting.init_app(app, UserUtils())
+
+        ... (Any other configuration) ...
+
+        return app