Set ssh config color syntax for vim editor

Allow vim to display right colors even when you edit the file from the
repo instead of the classic path `.ssh/config`.

Install/Templates/home/ssh/config

@@ -48,3 +48,5 @@ Host pluto
 IdentityFile ~/.ssh/id_server_eddsa
 HostName git.jovian-hersemeule.eu
 AddressFamily inet
+
+# vim: set syntax=sshconfig: