Add Junshen's personal page (alshedivat#979)

Added a link to my personal website to the README.

Author: daviddmc

README.md

@@ -83,6 +83,7 @@ Feel free to add your own page(s) by sending a PR.
 <a href="https://joahannes.github.io" target="_blank">★</a>
 <a href="https://dominikstrb.github.io" target="_blank">★</a>
 <a href="https://tylerbarna.com" target="_blank">★</a>
+<a href="https://daviddmc.github.io/" target="_blank">★</a>
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