Add link to contributions page

Author: brendanheywood

general/community/credits/index.md

@@ -7,6 +7,7 @@ sidebar_position: 8
 A huge thank you to everyone who contributed to Moodle in various ways:
 
 - [Developer credits](https://moodle.org/dev/) - Developers who have contributed directly to core Moodle code
+- [Developer contributions](https://moodle.org/dev/contributions.php) - Developer contributions by git commits
 - [Documentation credits](./credits/documentation) - Documentation writers
 - [Moodle.org courses credits](./credits/moodleorg) - Facilitators and moderators on moodle.org and particularly helpful Moodlers in the forums, plugin validators and reviewers
 - [Moodle libraries credits](./credits/thirdpartylibs) - Authors of libraries which are redistributed as part of Moodle