Dear TOR, Welcome to MediaWiki.org!
Yes, Welcome! This site is dedicated to the documentation of the MediaWiki software, the software behind many wikis, including that of Wikipedia and the Wikimedia Foundation projects.
Please, take a look at the following pages. They might prove useful to you as a newcomer here:
If you have any questions, please ask me on my talk page. Once again, welcome, and I hope you quickly feel comfortable here, and find this site a beneficial documentation of the MediaWiki software.
Thanks, and regards, Skizzerz 23:45, 5 June 2008 (UTC)
Your extensions 
Hello, one extension written by you (or more) is listed on Git/Conversion/Extensions still in svn. The SVN repository will be closed in the future, and localisation support on translatewiki.net has already been dropped: please help update the list so that we know which extensions are still of interest and should therefore be moved to Git, and if possible volunteer to continue maintaining some requesting migration, or find someone else who can do so. Thanks, Nemo 14:58, 12 October 2012 (UTC)