[rosalind] add default data to cons example
[rosalind] add default data to cons example

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