Explain project name in readme

[mk-pmb]

Hi! I was trying to find info on what the project name means and how/why it was chosen. I found #17 but that part of the issue seems to have been lost somehow. Would you mind adding an official explanation?

Edit: I found some additional speculation in a Medium article, saying that Jaromil "think[s] it comes from" the German word "frei" (free) with an added "or" suffix to make it sound like a Viking name. A plausible opinion, but not authoritative.