Add TypeQL to GitHub's syntax highlighters via linguist

[grabl]

This issue was originally posted by @jmsfltchr on 2018-05-29 20:46.

It's unlikely TypeQL will be considered mainstream enough, since the criteria is for a language to be used in hundreds of repos. However, at some point down the line we want TypeQL to be highlighted on Github and in GitHub Gists. To do this I believe we need to submit a PR to the linguist repo: https://github.com/github/linguist

[vmax]

@haikalpribadi do we have something to build it upon? is there a highlighter in Workbase/grakn's web ui?

[haikalpribadi]

We do have a syntax highlighter grammar for Sublime, and several other IDEs by the community, @vmax. We're planning to aggregate them into the graknlabs/graql repo once we split Graql out (issue #4456) really soon!