Merge pull request #1193 from kube-hetzner/readme/add-opentofu

Add opentofu reference to readme

Author: mysticaltech

README.md

@@ -74,7 +74,7 @@ Then you'll need to have [terraform](https://learn.hashicorp.com/tutorials/terra
 
 ```sh
 brew tap hashicorp/tap
-brew install hashicorp/tap/terraform
+brew install hashicorp/tap/terraform # OR brew install opentofu
 brew install packer
 brew install kubectl
 brew install hcloud