added link to sister tut

Author: lichtkind

README.md

@@ -2,5 +2,5 @@
 
    * extensive Perl 6 tutorial covers all major language parts,
    * building step by step (chapter by chapter) an useful application,
-   * has parallel Perl 5 tutorial under ...
+   * has parallel Perl 5 tutorial under [bitbucket](https://bitbucket.org/lichtkind/perl-tut-problem-solver)
    * start reading from [Menu](/menu.md)

menu.md

@@ -1,9 +1,9 @@
 
-   + [Chapter 0](/chapter_0/text0.md) [Code](/chapter_0/bn0.pl6)
-   + [Chapter 1](/chapter_1/text1.md) [Code](/chapter_1/bn1.pl6)
-   + [Chapter 2](/chapter_2/text2.md) [Code](/chapter_2/bn2.pl6)
-   + [Chapter 3](/chapter_3/text3.md) [Code](/chapter_3/bn3.pl6)
-   + [Chapter 4](/chapter_4/text4.md) [Code](/chapter_4/bn4.pl6)
+   + [Chapter 0](/chapter_0/text0.md)    [Code](/chapter_0/bn0.pl6)
+   + [Chapter 1](/chapter_1/text1.md)    [Code](/chapter_1/bn1.pl6)
+   + [Chapter 2](/chapter_2/text2.md)    [Code](/chapter_2/bn2.pl6)
+   + [Chapter 3](/chapter_3/text3.md)    [Code](/chapter_3/bn3.pl6)
+   + [Chapter 4](/chapter_4/text4.md)    [Code](/chapter_4/bn4.pl6)
    + Chapter 5
    + Chapter 6
    + Chapter 7