[euler] document problem 6 solution
[euler] document problem 6 solution

Quinny/perl6-examples,shlomif/perl6-examples,shlomif/perl6-examples,stmuk/perl6-examples,Quinny/perl6-examples,shlomif/perl6-examples,perl6/perl6-examples,stmuk/perl6-examples,Quinny/perl6-examples,shlomif/perl6-examples,stmuk/perl6-examples,Quinny/perl6-examples,perl6/perl6-examples,shlomif/perl6-examples,stmuk/perl6-examples,Quinny/perl6-examples,perl6/perl6-examples,perl6/perl6-examples,stmuk/perl6-examples,perl6/perl6-examples