Add documentation for terraform feature

docs/terraform.md

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+# Terraform
+
+You can manage your CPLN configuration through `cpflow` commands and later invoke the generation of Terraform configuration files by running:
+
+```sh
+cpflow terraform generate
+```
+
+This command will create Terraform configurations for each application defined in `controlplane.yml`, utilizing templates from the `templates` folder.
+
+Each time this command is invoked, Terraform configurations will be recreated. You can continue working with CPLN configuration files in YAML format and simply transform them to Terraform format anytime.