docs added fixes #1

README.md

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+# Terragrunt Demo
+
+## Getting started
+
+This project assumes you have gathered some initial experience using Terraform/OpenTofu to create and maintain your infrastructure.
+
+Install Terraform according to their docs:
+[Terraform](https://www.terraform.io)
+
+Or use OpenTofu as a replacement for Terraform:
+[OpenTofu](https://opentofu.org)
+
+You can find all necessary steps to install Terragrunt here:
+[Terragrunt](https://terragrunt.gruntwork.io)
+
+We are using `tfenv` for managing the Terraform binary
+[tfenv](https://github.com/tfutils/tfenv.git)
+
+We are using `tgenv` for managing the Terragrunt binary
+[tgenv](https://github.com/cunymatthieu/tgenv.git)
+
+## Running Terragrunt
+
+Install the needed `terraform` version according to `.terraform-version`:
+
+`tfenv install`
+
+Install the needed `terragrunt` version according to `.terragrunt-version`:
+
+`tgenv install`
+
+According to the chosen environment, one would execute `terragrunt` like so:
+
+Creating a plan to see what would have been executed:
+
+`cd environment/nonlive && terragrunt plan`
+
+Execute the plan:
+
+`cd environment/nonlive && terragrunt apply`