Update Language Support wiki page with examples

[marcelgerber]

The Language Support page, especially the Defining a new language part, could use some improvements.
The aforementioned section does not contain any examples of how exactly to "load it using require(), register it with CodeMirror using CodeMirror.defineMode(), then call LanguageManager.defineLanguage() as above".
Thus, I'd suggest to add some examples here (for both the CodeMirror.defineMode() and CodeMirror.defineSimpleMode() methods of doing it).

Also, I'm unsure if we still need the Notes on "language" support (as of Sprint 21) section on this user-facing wiki page.

[petetnt]

Oh yeah, that was the page that I was reading some time ago and thought that it needs some work (and then promptly forgot about it...)

👍 for nuking the Notes on... section too. (or at least moving it to another document, at this point I'd say it's just noise).

[foice]

Hello, the example I have been pointed at
https://gist.github.com/sprintr/0a6dafd7204fd4002c39
is a great bootstrap.

I am now seeking for code to have SimpleCode to find empty lines and highlight the whole line and for activating code folding when certain reg-exp are found.

Is line-highlight and code-folding available in SimpleCode? or is it too simple ??

Thanks for reading
Roberto