[modules] add net module

modules/net/README.md

@@ -0,0 +1,5 @@
+# `net` module
+
+The `net` module defines an extended configuration interface for
+networking: wifi (`net/wifi`), ethernet (`net/wire`) and bluetooth
+(`net/blue`).

modules/net/default.nix

@@ -0,0 +1,9 @@
+{ config, pkgs, lib, ... }:
+
+{
+	imports = [
+		./blue	# Bluetooth
+		./wifi	# Wireless
+		./wire	# Ethernet
+	];
+}