text edits to readme.md

hi, thanks for keeping up such an awesome project. I've been looking for something like this for way too long.

honestly, I am really only submitting these changes as a test to make sure I actually understand how forking and pull requests work. (I'm new here)

Even so, the edits I made give a consistent grammatical structure (I adjusted the syntax of #2) and punctuation (removed periods from the #1 & #2) to the Summary section of the readme.md file. 

(I'm a copyeditor IRL)

Thanks again!