terraform/vedenemo: add README

This documents the `vedenemo` Terraform state.

Signed-off-by: Florian Klink <[email protected]>

terraform/vedenemo/README.md

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+<!--
+SPDX-FileCopyrightText: 2022-2024 TII (SSRC) and the Ghaf contributors
+SPDX-License-Identifier: CC-BY-SA-4.0
+-->
+
+# vedenemo
+
+This describes a resource group holding the `az.vedenemo.dev` DNS Zone, for
+which a delegation was set up, and then peeks at the Terraform states of other
+environments to set up a NS delegation for `$env_shortcode.az.vedenemo.dev`,
+allowing each environment to manage its DNS Records in its zones.
+
+In the future, it might also be used to manage other resources that are not
+specific to one environment.
+
+This is using Terragrunt, like `../prod-eun`. Please refer to the `README.md`
+there for more instructions.