Document Euler problem 1

Author: paultcochrane

euler/prob001-cspencer.pl

@@ -1,3 +1,20 @@
+=begin pod
+
+=head1 Project Euler Problem 1
+
+=head1 AUTHOR: cspence
+
+=head1 DESCRIPTION
+
+If we list all the natural numbers below 10 that are multiples of 3 or 5, we
+get 3, 5, 6 and 9. The sum of these multiples is 23.
+
+Find the sum of all the multiples of 3 or 5 below 1000.
+
+Expected answer: 233168
+
+=end pod
+
 use v6;
 
 (1..^1000).grep({ ! ($^a % 3 and $^a % 5) }).reduce({ $^a + $^b }).say;