Add ddev contrib and contributing.md file
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3536660. -->
Reported by: [dmundra](https://www.drupal.org/user/866436)
Related to !2
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Add <a href="https://github.com/ddev/ddev-drupal-contrib">https://github.com/ddev/ddev-drupal-contrib</a> to the repo to allow ease of development</p>
> Related issue: [Issue #3533549](https://www.drupal.org/node/3533549)
issue