Initial data commit

Task/Sorting-algorithms-Quicksort/Raku/sorting-algorithms-quicksort.raku

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+# Empty list sorts to the empty list
+ multi quicksort([]) { () }
+
+ # Otherwise, extract first item as pivot...
+ multi quicksort([$pivot, *@rest]) {
+     # Partition.
+     my $before := @rest.grep(* before $pivot);
+     my $after  := @rest.grep(* !before $pivot);
+
+     # Sort the partitions.
+     flat quicksort($before), $pivot, quicksort($after)
+ }