create chat example

[tcoopman]

This adds a very basic chat example. It's functional, but I'm definetely open for suggestions, changes,...

One question I have, a problem I saw, was that I sent messages to a closed websocket, which resulted in errors. I was wondering what would be the best way of handling this.
At the moment I do my best to remove the connections that will be closed, but I think race conditions are possible where you try to send something to a socket that's not there anymore.

[tcoopman]

as discussed in: #75

[tcoopman]

and a totally of topic question, but what editor do you use and does it manage the syntax highlighting ok? I'm using neovim and it completely breaks on the inline html (but I don't care too much about that), the issue is though that it doesn't recover and highlight the rest of the file with proper ocaml formatting 😢

[tcoopman]

Anything else you want me to change?

[aantron]

Thank you! I'll make some minor edits and link the example from the example TOC.

[aantron]

but what editor do you use and does it manage the syntax highlighting ok?

I use VS Code, and it eventually recovers from mis-highlighting HTML in an .eml.ml file. However, in "real" projects I use .eml.html, where the syntax highlighting is fine (OCaml code just doesn't get highlighted, basically). See also #55 (comment) as a related issue.

Here's an example of an .eml.html file on GitHub.

[tcoopman]

Thanks. I'll probably also separate eml as much as possible from ml. I notice that vim recovers mostly as well, but it doesn't for this chat example.

[aantron]

Ok, the example is now linked, and loaded into the playground!