Add Python example script demonstrating factorial and greeting

python_example.py

@@ -0,0 +1,20 @@
+def greet_user(name):
+    print(f"Hello, {name}! Welcome to First Contributions.")
+
+def factorial(n):
+    if n == 0 or n == 1:
+        return 1
+    else:
+        return n * factorial(n-1)
+
+def print_factorials_up_to(n):
+    print(f"Factorials from 0 to {n}:")
+    for i in range(n+1):
+        print(f"{i}! = {factorial(i)}")
+
+if __name__ == "__main__":
+    user_name = input("Enter your name: ")
+    greet_user(user_name)
+
+    max_num = int(input("Enter a number to calculate factorials up to: "))
+    print_factorials_up_to(max_num)