I am new to Ruby (and Rails) and have just (finally) succeeded in setting up qpixel on my Mac. I headed over to our [easy GitHub issues](https://github.com/codidact/qpixel/issues?q=is%3Aissue+is%3Aopen+label%3A%22complexity%3A+easy%22) looking for something to use to get started, and then realized... wait, I don't know my way around this code base at all. There are presumably conventions about what goes where, what the architecture is, etc that would be obvious to someone more experienced than I.
Is there an overview of the project for people like me? Are there key files that I should look at first? I looked for internal documentation but it's not in an obvious place (like a "doc" directory). We do have an old [wiki](https://github.com/codidact/docs/wiki), but its focus is a little different (and did I say "old"?).
How do I get from an assertion on GitHub that an issue is "easy" to finding the right places in the code to start poking? If there are tools that make this easier (what's the normal IDE for Ruby?), I'm interested in that too.