Adds explanation of where binaries should go

Closes Raku#3999

doc/Language/modules.pod6

@@ -704,6 +704,8 @@ Vortex-TotalPerspective/
 ├── LICENSE
 ├── META6.json
 ├── README.md
+└── bin
+│    └── vortex
 └── t
     └── basic.t
 =end code
@@ -754,7 +756,15 @@ my $template-text = %?RESOURCES<templates/default-template.mustache>.slurp;
 
 =end item
 
-=item The C<README.md> file is a L<markdown-formatted|https://help.github.com/articles/markdown-basics/>
+=item Programs and scripts that you need in the C<$PATH> for execution need
+to be
+included in the C<bin> directory; these will be copied to whatever directory
+your installed Rakudo distribution has allotted for executables; could be
+something like C<~/.rakubrew/shims/> (if you use the excellent
+C<App::Rakubrew> for them)
+
+=item The C<README.md> file is a
+L<markdown-formatted|https://help.github.com/articles/markdown-basics/>
 text file, which will later be automatically rendered as HTML by GitHub/GitLab for modules kept
 in those ecosystems or by L<modules.raku.org|https://modules.raku.org> website for modules
 kept on L<CPAN|/language/faq#index-entry-CPAN_(FAQ)>.