Update index.md (#55)

Add Christian Stjernberg as master thesis student

Author: christian-stj

index.md

@@ -96,7 +96,7 @@ See [https://github.com/chains-project/](https://github.com/orgs/chains-project/
 * Post-doctoral researchers: [Deepika Tiwari](https://deee92.github.io/), [Mohammad M. Ahmadpanah](https://smahmadpanah.github.io/)
 * PhD students: [Sofia Bobadilla](https://www.kth.se/profile/sofbob?l=en), [Eric Cornelissen](https://ericcornelissen.dev/), [Javier Ron](https://www.kth.se/profile/javierro), [Aman Sharma](https://algomaster99.github.io/), [Yuxin Liu](https://www.kth.se/profile/yuxinli), [Frank Reyes](https://www.kth.se/profile/frankrg/?l=en), [Yekatierina Churakova](https://www.kth.se/profile/yekchu?l=en), [Carmine Cesarano](https://carminecesarano.github.io/) (visiting), [Yogya Gamage](https://scholar.google.se/citations?user=m_67-NAAAAAJ), [Vivi Andersson](TODO), [Serena Cofano](https://scholar.google.com/citations?user=Udd1jsMAAAAJ&hl=en) (visiting)
 * Research engineers & assistants: [Raphina Liu](https://scholar.google.se/citations?user=h1uxQNcAAAAJ), [Elias Lundell](https://www.eliaslundell.se/), [Monica Jin](https://www.kth.se/profile/mjin/), [Diogo Torres Correia](https://www.kth.se/profile/diogotc)
-* Master's students: [Leonard Husmann](TBD), [Tom Sorger](https://tomsorger.com/), [Ludvig Christensen](https://github.com/ludvigch)
+* Master's students: [Leonard Husmann](TBD), [Tom Sorger](https://tomsorger.com/), [Ludvig Christensen](https://github.com/ludvigch), [Christian Stjernberg](https://christian.stjernberg.com)
 
 Chains alumni: [Arvid Siberov](https://siberov.se), [Linus Östlund](https://www.kth.se/profile/linusost/), [Gabriel Skoglund](https://www.kth.se/profile/gabsko), [César Soto-Valero](https://www.cesarsotovalero.net/), [Martin Wittlinger](https://github.com/MartinWitt/), [Felix Qvarfordt](https://www.linkedin.com/in/felix-qvarfordt-4b1196a3/), [Daniel Williams](https://www.linkedin.com/in/d-willi/), [Oliver Schwalbe Lehtihet](https://www.linkedin.com/in/oliver-schwalbe-lehtihet/), [Federico Bono](https://www.linkedin.com/in/federico-bono/), [Christofer Vikström](TODO), [Mikhail Shcherbakov](https://www.kth.se/profile/mshc)