Added documentation

README.md

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 # proxmox-talos-opentofu
+Proof of concept project using [OpenTofu](https://opentofu.org/) to install a Kubernetes cluster on a Proxmox
+hypervisor using [Talos Linux](https://www.talos.dev/).
+
+## Requirements
+You need to have installed on your local machine:
+* [OpenTofu](https://opentofu.org/)
+* [kubectl](https://kubernetes.io/docs/reference/kubectl/) (for testing and cluster interaction)
+
+## Provisioning
+The project is grouped in two modules:
+* proxmox: provisioning of virtual machines, operating systems and Kubernetes cluster
+* kubernetes: provisioning of Kubernetes cluster resources
+
+So you want first to provision the Proxmox part: create a `credentials.auto.tfvars` file based on the example.
+```shell
+cd proxmox
+tofu init
+tofu plan
+tofu apply
+```
+
+You can then grab the kube config file for Kubernetes provisioning like so:
+```shell
+tofu output kubeconfig
+```
+and put its contents into your `~/.kube/config`.
+
+Test if your cluster access works by listing the nodes:
+```shell
+kubectl get nodes
+```
+
+Secondly, you can provision the Resources inside the Kubernetes cluster:
+```shell
+cd kubernetes
+tofu init
+tofu plan
+tofu apply
+```
+
+## Information Sources
+* Terraform providers/modules
+  * [terraform-provider-proxmox](https://github.com/Telmate/terraform-provider-proxmox)
+  * [terraform-provider-talos](https://github.com/siderolabs/terraform-provider-talos)

proxmox/credentials.auto.tfvars.example

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+proxmox_api_url = "https://192.168.1.10:8006/api2/json"
+proxmox_api_token_id = "root@pam!supersecret"
+proxmox_api_token_secret = "js7ej5k9-hd75-hd64-js56-js834jmd732"
+proxmox_target_node = "your proxmox node"
+
+cluster_name = "your cluster name"
+cluster_endpoint = "https://192.168.1.100:6443"