feat(iaas): onboard iaas project datasource (#955)

* feat: onboard iaas project datasource

docs/data-sources/iaas_project.md

@@ -0,0 +1,35 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "stackit_iaas_project Data Source - stackit"
+subcategory: ""
+description: |-
+  Project details. Must have a region specified in the provider configuration.
+---
+
+# stackit_iaas_project (Data Source)
+
+Project details. Must have a `region` specified in the provider configuration.
+
+## Example Usage
+
+```terraform
+data "stackit_iaas_project" "example" {
+  project_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `project_id` (String) STACKIT project ID.
+
+### Read-Only
+
+- `area_id` (String) The area ID to which the project belongs to.
+- `created_at` (String) Date-time when the project was created.
+- `id` (String) Terraform's internal resource ID. It is structured as "`project_id`".
+- `internet_access` (Boolean) Specifies if the project has internet_access
+- `state` (String) Specifies the state of the project.
+- `updated_at` (String) Date-time when the project was last updated.