Add new Markdown resource under Advanced Topics

[Pranav-MSK]

I would like to add Interactive Markdown Tutorial to the Related Skills section of Advanced Topics. I feel like it would be really helpful.
It is a 10-minute browser game that teaches you how to format bold text, lists, images, and tables in Markdown files.

[github-actions]

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[Pranav-MSK]

@Adez017 , I would like to work on this issue as an NSoC Contributor. Kindly assign it to me.

I would also like to include Getting started with Markdown resource as well. Its from the official github blog

[tri-pti]

I would like to work on this issue, please assign it to me

[Adez017]

Go ahead @Pranav-MSK