Added proxmox box as provider and latest version of bpg/proxmox as version

.gitignore

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+.envrc
+.terraform
+.terraform.*

providers.tf

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+provider "proxmox" {
+  endpoint = "https://prox-console.tail1ad20b.ts.net/"
+  # api_token read from PROXMOX_VE_API_TOKEN
+}

versions.tf

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+terraform {
+  required_providers {
+    proxmox = {
+      source = "bpg/proxmox"
+      version = "0.108.0"
+    }
+  }
+}