ITSM-NG (#5615)

* 'Add new script'

* Update itsm-ng-install.sh

* Update itsm-ng-install.sh

---------

Co-authored-by: push-app-to-main[bot] <203845782+push-app-to-main[bot]@users.noreply.github.com>
Co-authored-by: Slaviša Arežina <58952836+tremor021@users.noreply.github.com>

frontend/public/json/itsm-ng.json

@@ -0,0 +1,35 @@
+{
+  "name": "ITSM-NG",
+  "slug": "itsm-ng",
+  "categories": [
+    25
+  ],
+  "date_created": "2025-06-20",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": 80,
+  "documentation": "https://wiki.itsm-ng.org/en/home",
+  "website": "https://itsm-ng.com",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons/svg/itsm-ng.svg",
+  "config_path": "/etc/itsm-ng",
+  "description": "ITSM-NG is a powerful, open-source IT Service Management (ITSM) solution designed for managing IT assets, software, licenses, and support processes in accordance with ITIL best practices. It offers integrated features for asset inventory, incident tracking, problem management, change requests, and service desk workflows.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/itsm-ng.sh",
+      "resources": {
+        "cpu": 2,
+        "ram": 2048,
+        "hdd": 10,
+        "os": "debian",
+        "version": "12"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": "itsm",
+    "password": "itsm"
+  },
+  "notes": []
+}