Update make-a-github-readme.mdx

Author: sonnynomnom

projects/make-a-github-readme/make-a-github-readme.mdx

@@ -134,3 +134,4 @@ You now have your very own README on your profile! We’d love to see what you
 - [Manging Your Profile README](https://docs.github.com/en/account-and-profile/how-tos/setting-up-and-managing-your-github-profile/customizing-your-profile/managing-your-profile-readme)
 - [March 2024 GitHub Glow Up Challenge Winners](https://www.codedex.io/community/monthly-challenge/UcTmQlizQK8eVO5hyEeX/winners)
 - [Markdown Cheatsheet](https://github.com/adam-p/markdown-here/wiki/markdown-cheatsheet)
+- [Markdown Guide](https://markdownguide.offshoot.io/basic-syntax)