Add Vertical Velocity Control from Kerbal Stuff

This pull request was automatically generated by Kerbal Stuff on behalf of Diazo, to add [Vertical Velocity Control](https://kerbalstuff.com/mod/459/Vertical%20Velocity%20Control) to CKAN.

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