feat(scf): Add STACKIT Cloud Foundry (#991)

* onboard STACKIT Cloud Foundry resources/datasource

docs/data-sources/scf_organization_manager.md

@@ -0,0 +1,41 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "stackit_scf_organization_manager Data Source - stackit"
+subcategory: ""
+description: |-
+  STACKIT Cloud Foundry organization manager datasource schema.
+---
+
+# stackit_scf_organization_manager (Data Source)
+
+STACKIT Cloud Foundry organization manager datasource schema.
+
+## Example Usage
+
+```terraform
+data "stackit_scf_organization_manager" "example" {
+  project_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  org_id     = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `org_id` (String) The ID of the Cloud Foundry Organization
+- `project_id` (String) The ID of the project associated with the organization of the organization manager
+
+### Optional
+
+- `region` (String) The region where the organization of the organization manager is located. If not defined, the provider region is used
+
+### Read-Only
+
+- `created_at` (String) The time when the organization manager was created
+- `id` (String) Terraform's internal resource ID, structured as "`project_id`,`region`,`org_id`,`user_id`".
+- `platform_id` (String) The ID of the platform associated with the organization of the organization manager
+- `updated_at` (String) The time when the organization manager was last updated
+- `user_id` (String) The ID of the organization manager user
+- `username` (String) An auto-generated organization manager user name