Sum of Natural Numbers in python

i have added Sum of Natural Numbers in c language

Author: priyankashrama

Diff for: Sum_of_Natural_Numbers

@@ -0,0 +1,14 @@
+if num < 0:
+   print("Enter a positive number")
+else:
+   sum = 0
+   # use while loop to iterate until zero
+   while(num > 0):
+       sum += num
+       num -= 1
+   print("The sum is", sum)
+   
+   
+   
+   OUTPUT:-
+   The sum is 136