This is just a wrapper package which depends on the "true" language
service package and links to the README.
Note that I've put this under "packages/" because I would eventually
like to extract some core bits out of the language service into separate
packages (for example the code that is currently copy-pasta'd with
this repo and the codemirror-graphql one), and Lerna would be a good
tool for managing multiple related packages; whether or not those
packages end up living in this repo or another one, seems like it's a
good idea to follow the Lerna convention.