Added Yolan and Thomas to the contributor list

data/contact.yaml

@@ -129,6 +129,17 @@ people: [
     href: "https://profiles.sussex.ac.uk/p352567-william-roper",
     expertise: "Zoom-in simulations",
   },
+  {
+    name: Thomas Sandnes,
+    affil: "ICC, Durham University",
+    href: "https://www.durham.ac.uk/staff/thomas-d-sandnes/",
+    expertise: "Planetary simulations"    
+  },
+  {
+    name: Yolan Uyttenhove,
+    affil: "Ghent University",
+    expertise: "Hydrodyanmics schemes",
+  },
   {
     name: James Willis,
     href: "https://scholar.google.com/citations?user=vj6vz9MAAAAJ&hl=en",