docs: add comments to describe the code

terraform/projects/simple-vm/provider.tf

@@ -1,18 +1,22 @@
+# Define the required Terraform provider block
 terraform {
   required_providers {
     proxmox = {
-      source = "bpg/proxmox"
+      source = "bpg/proxmox" # Use the community Proxmox provider from the bpg namespace
     }
   }
 }
 
+# Configure the Proxmox provider with API and SSH access
 provider "proxmox" {
-  endpoint  = var.proxmox_endpoint
-  api_token = var.proxmox_api_token
-  insecure  = false
+  endpoint  = var.proxmox_endpoint  # Proxmox API URL (e.g., https://proxmox.local:8006/api2/json)
+  api_token = var.proxmox_api_token # API token for authentication (should have appropriate permissions)
+  insecure  = false                 # Reject self-signed or invalid TLS certificates (set to true only in trusted/test environments)
+
+  # Optional SSH settings used for VM customization via SSH
   ssh {
-    agent       = false
-    private_key = file("~/.ssh/id_ed25519")
-    username    = "root"
+    agent       = false                        # Do not use the local SSH agent; use key file instead
+    private_key = file("~/.ssh/id_ed25519")    # Load SSH private key from the local file system
+    username    = "root"                       # SSH username for connecting to the Proxmox host
   }
-}
+}