Set HTML class attribute in Markdown with {: CSS_SELECTOR }

[drhus]

it is quite common to add class to an element in several markdown parser such as {#id .class}

such as

• Hello Listed {: CSS_SELECTOR } to attach additional HTML attributes to the rendered Markdown output as <p class="CSS_SLECTOR>Hello Listed

i love to see that with listed especially with it's ability to customize css ❤️