Added a Youtube link option

[francisrod01]

This is a native markdown way of showing a thumb to a link. All I did here was add a shortcut to make it easier.

Further we can add the Youtube icon to the font.

I didn't style the button because I didn't find any information related to it's font. I strongly recommend this website: https://www.icofont.com/icons

[![The Waffle Ninja](https://img.youtube.com/vi/StTqXEQ2l-Y/0.jpg "this is my title")](https://www.youtube.com/watch?v=aoeiu)

Preview:

I test it in my website:

Also in the demo project:

References:

• Is it possible to embed Youtube/Vimeo videos in Markdown