Add link to a new academic's website (alshedivat#3075)

Love the theme and just used it for my own personal website! Thought I'd
link from here as suggested in the README to show my support! :)

Author: NishanthJKumar

README.md

@@ -160,6 +160,7 @@ Feel free to add your own page(s) by sending a PR.
 <a href="https://jpfonseca.github.io/" target="_blank">★</a>
 <a href="https://dmitryryumin.github.io/" target="_blank">★</a>
 <a href="https://alexiglad.github.io/" target="_blank">★</a>
+<a href="https://nishanthjkumar.com/" target="_blank">★</a>
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