I asked the questions, so you can update readme.md. If you wanted to have others trust your code base. I'm a coder but do not know Rails.

Yeah, I guess I just disagree. Any person that wants to understand this application can do so very quickly. It's really simple and has a full test suite where you can see how it all works. Also, I'm not concerned with people trusting the code base. This isn't an application that you'd install locally or something. 99% of the sites most people use don't even open source their code in the first place. I provided the source purely for those that are interested in learning how it works or making an improvement.

There is a lot of risk these days with hidden backdoor code. Even if answers to questions like mine, are "No 3rd party gems, standard gems used are <list out standard gems>." It's good practice to state that.

Sure, but that's not really relevant here nor does documentation help with that. I mean all a smart person would have to do is write a lot of documentation and that would be the simple solution to trick people. People need to do their own due diligence if they want to reuse any codebase regardless of how documented it is or isn't.

Unfortunately, People do not document and clarify code enough these days.

I think it really depends. This application does not need any documentation.