chg: [contact] contact address updated

contact.md

@@ -5,3 +5,15 @@ bodyClass: page-contact
 ---
 
 CyCAT is a virtual [team](/team/). You can contact us if you want to help us, contribute or share ideas.
+
+CyCAT is backed and sponsored by the [Computer Incident Response Center Luxembourg (CIRCL)](https://www.circl.lu/).
+
+# Contact address
+
+```
+CIRCL - Computer Incident Response Center Luxembourg
+c/o "security made in Lëtzebuerg" (SMILE) g.i.e.
+16, bd d'Avranches
+L-1160 Luxembourg
+Grand-Duchy of Luxembourg
+```