Feature Analysis/Cohort Characterization Tool in ATLAS

@dir0417 @krfeeney @anthonysena
Kirstin- thanks for the great info!
We’re looking for a guide or instructions on to create new features. There is another post about how to so by Chris Knoll, but I think it’s a bit outdated and it led to an issue being created in github (How to create own features - Atlas Characterization - Summary Statistics). We searched the Book of OHDSI but didn’t find anything. Has anyone made an internal cheat-sheet or any guide? Thanks! Lisa