Add A Very Kerbal Christmas from Kerbal Stuff

This pull request was automatically generated by Kerbal Stuff on behalf of nazari, to add [A Very Kerbal Christmas](https://kerbalstuff.com/mod/426/A%20Very%20Kerbal%20Christmas) to CKAN.

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