Update README.md
Added methods for accessing temporaries as well as variables.
OK I lied before, it's still segfaulting and I still have to work on a few operators, but I've made quite a bit of progress with the testing etc. You can now add a Bool or an Int in main (I'll make actual Token and Expression types soon enough, hopefully it will cut down on bugs).
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.