Add Kerbal X-MAS from Kerbal Stuff

This pull request was automatically generated by Kerbal Stuff on behalf of ximrm, to add [Kerbal X-MAS](https://kerbalstuff.com/mod/440/Kerbal%20X-MAS) to CKAN.

Please direct questions about this pull request to [ximrm](https://kerbalstuff.com/profile/ximrm).