Clearly document and group pro vs free features

[devsarangi2]

Currently, in README.md, the pro features are marked as an * at the end of each line which is not helpful for someone who might be willing to buy the product. The pro features should be separated out with more clarity so a buyer know what exactly they are paying for.

[devsarangi2]

i'm not able to add label to this issue, (i dont get an option to click it). it should have the documentation label.

[waydabber]

Hi @devsarangi2 - here is a somewhat easier list: https://github.com/waydabber/BetterDisplay/wiki/List-of-free-and-Pro-features (with a comparison to some other apps I am working on).