fix: add arash

Author: chickymonkeys

content/research/research-4.md

@@ -7,6 +7,9 @@ coauthors:
 - coauthor: 
     name:   "Matti Mitrunen"
     link:   "https://sites.google.com/site/mattimitrunen/"
+- coauthor: 
+    name:   "Arash Nekoei"
+    link:   "https://sites.google.com/site/arashnekoei/"
 - coauthor: 
     name:   "Jósef Sigurdsson"
     link:   "https://www.josefsigurdsson.com/"