Add Nathan Simpson Portfolio item

Author: nathsimpson

README.md

@@ -665,6 +665,7 @@ Be sure to read [How To Contribute](CONTRIBUTING.MD)
 - [Fidalgo Pedro](https://fidalgo.dev/)
 - [Brittany Chiang](https://brittanychiang.com/)
 - [Developer Portfolios](https://github.com/emmabostian/developer-portfolios)
+- [Nathan Simpson](https://nathansimpson.design/)
 
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