Implement bridges and fillout readme with current state

modules/networking/main.tf

@@ -0,0 +1,29 @@
+resource "proxmox_network_linux_bridge" "management" {
+  node_name = var.proxmox_node_name
+  name      = "management"
+
+  address = "10.10.10.1/24"
+
+  comment = "Terraform managed Linux bridge for Proxmox API access and admin tools"
+}
+
+resource "proxmox_network_linux_bridge" "services" {
+  node_name = var.proxmox_node_name
+  name      = "services"
+
+  comment = "Terraform managed Linux bridge for general workload VMs and containers"
+}
+
+resource "proxmox_network_linux_bridge" "dmz" {
+  node_name = var.proxmox_node_name
+  name      = "dmz"
+
+  comment = "Terraform managed Linux bridge for externally exposed VMs and containers (e.g. web servers)"
+}
+
+resource "proxmox_network_linux_bridge" "isolated" {
+  node_name = var.proxmox_node_name
+  name      = "isolated"
+
+  comment = "Terraform managed Linux bridge for Lab/test VMs and containers with no external connectivity"
+}