This great mod was written by forum user @malkuth, back in the day. It's been kept updated, but he hasn't been active, and when I found some issues with it I offered to adopt it, he has graciously agreed. Original thread is here: https://forum.kerbalspaceprogram.com/index.php?/topic/40183-ksp-110-112-mission-controller-320-final-version-updated-6252021/
Mission Controller 3.3
Build Your Own Contracts In Career Mode
Quick Summery Of What Mission Controller D