Gleam support for the Rouge Ruby syntax highlighting library

[aognio]

I just created this pull request:

rouge-ruby/rouge#2070

Here's how it looks using the rougify command:

rougify highlight -l gleam /path/to/todomvc.gleam

The same file can be found on Github here:

https://github.com/gleam-lang/example-todomvc/blob/main/src/todomvc.gleam

My goal creating this is supporting syntax highlighting for Gleam in learnxinyminutes.com where I created a cheatsheet:

https://learnxinyminutes.com/docs/gleam/

Any feedback and collaborations will be appreciated.

[lpil]

Really cool! Thank you!