Update 'Main-Installer.sh'

Main-Installer.sh

@@ -15,6 +15,16 @@
 echo "Ubuntu 18.04 installatie script."
 echo "Domein zonder www:"
 read domain
+while true; do
+    read -p "bestaat www.${domain} in DNS -> yes/no?" yn
+    case $yn in
+        [Yy]* ) domainwww=1
+        break;;
+        [Nn]* ) domainwww=0
+        break;;
+        * ) echo "Kies yes of no.";;
+    esac
+done
 echo "Algemeen wachtwoord:"
 read password
 echo "Administrator email:"