Web: Add "Contribute" section

htdocs/index.php

@@ -98,6 +98,35 @@ add Cppcheck as an external tool.</p>
   or at the IRC channel <a href="irc://irc.freenode.net/">#cppcheck</a></li>
   <li>For more details look at the <a href="http://sourceforge.net/apps/mediawiki/cppcheck/">wiki</a></li>
 </ul>
+<h2>Contribute</h2>
+<p>You are welcome to contribute. Help is needed.</p>
+<dl>
+  <dt>Testing</dt>
+  <dd>Pick a project and test it's source with latest version. Write tickets to 
+  <a href="http://sourceforge.net/apps/trac/cppcheck/">Trac</a> about issues you
+  find from Cppcheck. If you test open source projects and write bug reports to
+  them, check the issues in the “<a href="http://sourceforge.net/apps/mediawiki/cppcheck/index.php?title=Found_bugs">Found bugs</a>”
+  wiki section, and write links to the bug reports you have created e.g. to our
+  <a href="http://sourceforge.net/apps/phpbb/cppcheck/">forum</a>, so we can keep
+  a track about them.</dd>
+  <dt>Developing</dt>
+  <dd>Pick a ticket from <a href="http://sourceforge.net/apps/trac/cppcheck/">Trac</a>,
+  write a test case for it (and write a comment to the ticket that test case has
+  been created). Or pick a test case that fails and try to fix it. Make a patch
+  and submit it to Trac either inline if it is small, or attach it as a file.</dd>
+  <dt>Marketing</dt>
+  <dd>Write articles, reviews or tell your friends about us. The more users we
+  have, the more people we have testing and the better we can become.</dd>
+  <dt>Design</dt>
+  <dd>Invent new good checks and create tickets to <a href="http://sourceforge.net/apps/trac/cppcheck/">Trac</a>
+  about them.</dd>
+  <dt>Integration</dt>
+  <dd>Write a plugin to your favorite IDE or create a package for your distribution
+  or operating system.</dd>
+  <dt>Technical Writer</dt>
+  <dd>Write better documentation for the bugs we find. Currently only a few bugs
+  have any documentation at all.</dd>
+</dl>
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