If you want to share your MediaWiki skin with the MediaWiki community, you can package it for a general use and post it to Wikimedia in the user styles gallery (http://meta.wikimedia.org/wiki/Gallery_of_user_styles).
You will need to include the contents of your skin's directory, including the main.css file and any images in it. For the JazzMeet skin, all of these will be in the skins/jazzmeet/ directory of your wiki's installation directory.
Additionally, you should include the PHP template file associated with your new skin. For JazzMeet, this is located in the skins/ directory, and is called JazzMeet.php.
Note
Do remember to include the print stylesheet, and any changes you have made to it. This is available in skins/common/, and is called commonPrint.css.
If you made any changes to the LocalSettings.php file, you may want to include that in your skin's package, as well. Do not worry about doing this if you have only made changes to...