mutateplaceholder VS mutator

This is my first medium-sized C++ project that I am working on. It was assigned to me with starter code by my friend/comp sci mentor who is an aspiring young programmer that will incorporate this app into a larger tool he will use for testing out his own unit tests. It is a CLI mutation software app. It has 4 commands of which I have mostly finished the first and main command which is the mutate command itself.

I just now am starting to write this README for the project as a rough draft of things that need to be conveyed, as I imagine what I am putting here is part of what needs to be done. I am less than halfway through describing all that the mutate command does here. This is why I wanted to ask someone, does it look ok how I have started this?

Just in case, wanted to mention that I changed the link from below to a new repo here and made the older one private. I seem to easily create disasters when trying to modify my .gitignore and I accidentally made a lot of internal stuff visible I did not want everyone seeing so I just decided to create a new public repo and save the old one as private :). Not saying you have to look at it haha, just that if you were looking at it or were going to, that is what is up.

I may be using the wrong vocabulary by saying open source project. What I mean is the software will be free when we are done with it, but I think he only has me working on it with him right now. This is a link to my part of it on my github, but the bulk of what I have contributed are the three classes at the bottom in the commands/mutate/ folders. Most of the other files were written by my friend and edited by me. Just know that I am still learning and there is not a lot of documentation/notes/comments probably in there as it should be yet, and several things I still have to modify/change :). So I will try and give some description here.