Updated README.md
Alright, I lied when I said it was working. I've been able to fix some of the issues with a few operators and the segfaulting on accessing a variable, and I've added a bit more to main to use for testing (although its still very buggy). I'll make Token and Expression types to hopefully cut down on bugs with accessing variables and adding temporaries soon enough.
Just getting everything set up to be used with Qt.