Added SQLAlchemy Example

SQLAlchemy-ORM/demo.py

@@ -0,0 +1,26 @@
+"""Very quick introduction to python classes"""
+
+from typing import override
+
+
+class Food:
+    name: str
+    calories: int
+
+    count: int = 1
+
+    def __init__(self, name: str, calories: int) -> None:
+        self.name = name
+        self.calories = calories
+
+    @override
+    def __str__(self) -> str:
+        return f"A(n) {self.name} with {self.calories}"
+
+    @override
+    def __repr__(self) -> str:
+        return f"Food({self.name!r}, {self.calories!r})"
+
+
+apple = Food("apple", 100)
+pizza = Food("pizza", 300)