Improve CSV importing

Build up a better template and all possible presets.

Similar wish or provide a KB type page at least with a visual example along with field descriptions, so one can see ahead of time what sort of data entry would be required for any upload. it would have been nice to be able to review any template before having to pay for premium just to be able to see what's involved and whether or not it feels feasible up front work to have the app be accurate or reasonable for long term use?