Add an example to read password

[gwenn]

No description provided.

[madprops]

Thanks for this. Seems I'm having some problem when I make an editor instance that uses a config:

    let h = MaskingHighlighter {masking: false};
    let mut editor = Editor::<()>::with_config(config);
    editor.set_helper(Some(h));

It complains on Some(h): expected (), found struct structs::MaskingHighlighter

[madprops]

Oh my bad I was init the editor wrong. Editor::with_config(config); worked.

[madprops]

Works great, thanks!