feat: add simple sum function example

Author: 2400030343SameerReddy

maths/sameer_sum.py

@@ -0,0 +1,8 @@
+def sum_two_numbers(a: int, b: int) -> int:
+    """
+    Returns the sum of two numbers.
+    Example:
+    >>> sum_two_numbers(2, 3)
+    5
+    """
+    return a + b