Add Den Patin to the students list

Author: denpatin

students/denpatin.md

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+# Student Profile
+
+- **Name**: Den Patin
+- **GitHub**: [@denpatin](https://github.com/denpatin)
+- **Twitter**: [@denpatin](https://twitter.com/denpatin)
+- **Linkedin**: [denpatin](https://www.linkedin.com/in/denpatin/en)
+- **Website**: [dpat.in](http://dpat.in)