[m-rev.] for review: link to the samples from the webpage

[Julien Fischer]

Link to the samples from the webpage.

include/about.inc:
     Add a link to the sample programs from the about section of the webpage.

Julien.

diff --git a/include/about.inc b/include/about.inc
index f06fc75..1e3bebd 100644
--- a/include/about.inc
+++ b/include/about.inc
@@ -8,6 +8,11 @@ the two languages are very different due to Mercury's purity, its type,
  mode, determinism and module systems.
  </p>

+<p>
+Some examples programs written in Mercury can be found
+<a href="https://github.com/Mercury-Language/mercury/tree/master/samples">here</a>.
+</p>
+
  <p>
  The main features of Mercury are:
  </p>