Added my portfolio website to README (alshedivat#2695)

Thanks for the amazing theme! ❤️ I've been using al-folio for several
years, during which I have considered migrating to more modern
technologies like MDX or similar but really found no theme that look
better than this.

README.md

@@ -152,6 +152,7 @@ Feel free to add your own page(s) by sending a PR.
 <a href="https://trandangtrungduc.github.io/" target="_blank">★</a>
 <a href="https://kinghowler.github.io/" target="_blank">★</a>
 <a href="https://anurye.github.io/" target="_blank">★</a>
+<a href="https://charlie-xiao.github.io/" target="_blank">★</a>
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