Add ImprovedStrategies from Kerbal Stuff

This pull request was automatically generated by Kerbal Stuff on behalf of Borsek, to add [ImprovedStrategies](https://kerbalstuff.com/mod/423/ImprovedStrategies) to CKAN.

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