feat(docs): Document built-in TerraformData resource

website/docs/cdktf/concepts/resources.mdx

@@ -1165,6 +1165,10 @@ securitygroup.NewSecurityGroup(stack, jsii.String("security2"), &securitygroup.S
 
 ## Special Cases
 
+### Built-in `terraform_data` resource
+
+There is a special resource built into Terraform itself. It is called [`terraform_data`](/terraform/language/resources/terraform-data) and implements the standard resource lifecycle, but does not directly take any other actions. In CDKTF it is exposed as the `TerraformData` class and you can import it directly from the `cdktf` package.
+
 ### Large Resource Configurations
 
 A few individual Terraform Resources have very deeply nested schemas with a lot of attributes. This blows up the config classes and slows down the code generation for languages besides Typescript. To work around this we sometimes limit the depth of the config classes and use `any` on deeper level, some attributes we directly expose as `any` on the top level config class.