chore: add control flow example

examples/01_simple_type_checking/03_control_flow.py

@@ -0,0 +1,9 @@
+def minimum(x: int, y: int):
+    if x < y:
+        return x
+    else:
+        return y
+
+a = 15
+b = 72
+c = minimum(a, b)