README section for advanced usage

[faraazahmad]

PR #272 introduces very useful functionality but I understand its not in the use cases for the average gem consumer. I was thinking, does it make sense to have an advanced usage section in the README, this could also include the eventual translation to whitequark/parser when that is complete.

I only opened this issue because I thought this is a really great feature that syntax_tree comes with out of the box, but such "advanced" features are not very discoverable right now.

[kddnewton]

Yeah I'm certainly open to this, at the moment this stuff is undocumented because I'm not sure about the final API and it's relatively untested. So I'm going to wait a bit, but the features will be documented as soon as they're ready I promise.

[faraazahmad]

How can I help?