Add mandatory .envrc setup-instruction to readme

README.adoc

@@ -13,6 +13,8 @@ To achieve the goal of having a working base infrastructure for the web the setu
 
 [source,bash]
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+vim .envrc config.auto.tfvars # Get the contents from password-manager
+dotenv allow
 terraform init
 terraform apply
 sleep 300 # Wait 5 minutes since the machines start _slow_ sometimes
@@ -33,8 +35,9 @@ The project is split into different steps, each responsible for another task.
 I use Terraform to provide the required infrastructure to run a Kubernetes-cluster.
 
 [WARNING]
-Make sure `config.auto.tfvars` with all the needed configuration-secrets is present otherwise the module cannot be applied!
-The file is safely stored in the password-manager.
+Make sure `.envrc` and `config.auto.tfvars` are present.
+Then run `dotenv allow` in the directory to apply the `.envrc`. +
+The files are safely stored in the password-manager.
 
 [source,bash]
 ----