[ELPA] New package: markdown-ts-appear

Hello,

I would like to submit markdown-ts-appear to NonGNU ELPA.

markdown-ts-appear is a minor mode for Emacs 31's built-in
markdown-ts-mode. It hides Markdown markup while reading and reveals
the smallest semantic element at point while editing. It also provides
optional asynchronous MathJax previews and visual decorations for code
blocks, callouts, block quotes, links, and tables.

Repository:
https://github.com/Thysrael/markdown-ts-appear

The main Lisp file is located at the repository root, and the default
branch should be tracked. No special build commands are required.

I am the author and maintainer.

Regards,
Thysrael