Add SCS image metadata properties description

user/pages/04.Reference/06.images/docs.en.md

@@ -50,12 +50,20 @@ Public images get certain properties that you can use for finding the latest ima
 
 Property name                    | Description                               |
 ---------------------------------|-------------------------------------------|
+architecture                     | Image only runs with this cpu architecture. Currently always `x86_64` |
 ci_job_id                        | Internal reference number                 |
 ci_pipeline_id                   | Internal reference number                 |
 cpu_arch                         | Image only runs with this cpu architecture. Currently always `x86_64` |
 default_ssh_username             | If not configured otherwise using cloud-init, servers using this image can be accessed with this ssh username. |
 distribution                     | Unique identifier for the distribution and version (e.g. `ubuntu-focal`) |
-os_distro                        | Name of the distribution (e.g. `ubuntu`)  |
+hypervisor_type                  | The hypervisor type. Currently always `qemu` |
+hw_disk_bus                      | Specifies the type of disk controller to attach disk devices to. Currently always `virtio` |
+hw_rng_model                     | A preference of a random-number generator device type added to the image's instances. Currently always `virtio` |
+image_description                | URL to the vendor's image repository notes |
+image_source                     | URL to the vendor image file that has been used for this image |
+image_build_date                 | Image build date |
+image_original_user              | If not configured otherwise using cloud-init, servers using this image can be accessed with this ssh username. |
+os_distro                        | Name of the distribution (e.g. `ubuntu`) |
 os_type                          | Operating system type (currently always `linux`) |
 os_version                       | Version of the operating system (e.g. `20.04`) |
 source_sha512sum                 | SHA512 hash of the original image file, as provided by the vendor under `source_url` |