docs: Add documentation for service_offering_details feature

- Update service offering documentation with GPU examples
- Add service_offering_details parameter documentation
- Update CHANGELOG with new feature entry
- Include practical examples for GPU configuration

Author: jean

CHANGELOG.md

@@ -1,5 +1,9 @@
 ## 0.4.0 (Unreleased)
 
+FEATURES:
+
+* **New Resource Attribute**: `cloudstack_service_offering` now supports `service_offering_details` for GPU configuration and other advanced settings [GH-246]
+
 IMPROVEMENTS:
 
 * Restore support for managing resource tags as CloudStack 4.11.3+ and 4.12+ support tags again [GH-65]

website/docs/r/service_offering.html.markdown

@@ -12,10 +12,30 @@ A `cloudstack_service_offering` resource manages a service offering within Cloud
 
 ## Example Usage
 
+### Basic Service Offering
+
 ```hcl
 resource "cloudstack_service_offering" "example" {
     name = "example-service-offering"
     display_text = "Example Service Offering"
+    cpu_number = 2
+    memory = 4096
+}
+```
+
+### GPU Service Offering
+
+```hcl
+resource "cloudstack_service_offering" "gpu_offering" {
+    name = "gpu-a6000"
+    display_text = "GPU A6000 Instance"
+    cpu_number = 4
+    memory = 16384
+    
+    service_offering_details = {
+        pciDevice = "Group of NVIDIA A6000 GPUs"
+        vgpuType  = "A6000-8A"
+    }
 }
 ```
 
@@ -69,6 +89,9 @@ The following arguments are supported:
 
 * `storage_tags` - (Optional) Storage tags to associate with the service offering.
 
+* `service_offering_details` - (Optional) A map of service offering details for GPU configuration and other advanced settings. Common keys include `pciDevice` and `vgpuType` for GPU offerings.
+    Changing this forces a new resource to be created.
+
 ## Attributes Reference
 
 The following attributes are exported: