Check that the maximum number of users is not exceeded

src/freedombone-adduser

@@ -73,6 +73,15 @@ if [ ! -f "$COMPLETION_FILE" ]; then
     exit 3
 fi
 
+# shellcheck disable=SC2126
+no_of_users=$(find /home/ -maxdepth 1 -type d | grep -Fxv "/home/go" | grep -Fxv "/home/gogs" | grep -Fxv "/home/pihole" | grep -Fxv "/home/" | wc -l)
+
+# shellcheck disable=SC2086
+if [ $no_of_users -ge 10 ]; then
+    echo $"Maximum number of users reached"
+    exit 4
+fi
+
 # Minimum number of characters in a password
 MINIMUM_PASSWORD_LENGTH=$(grep 'MINIMUM_PASSWORD_LENGTH=' "/usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-passwords" | head -n 1 | awk -F '=' '{print $2}')