updated readme

modules/network/README.md

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+# Network Configuration Modules
+
+This directory contains networking configurations for all machines in the Home Lab.
+
+## Structure
+
+- **`common.nix`** - Shared networking settings used by all machines
+  - nftables firewall enabled
+  - SSH access with secure defaults
+  - Tailscale VPN for remote access
+  - Basic firewall rules (SSH port 22)
+
+- **`network-<machine-name>.nix`** - Machine-specific networking configurations
+  - Import `common.nix` for shared settings
+  - Override or extend with machine-specific requirements
+  - Define hostname, hostId, and additional firewall ports
+
+## Current Machines
+
+### network-congenital-optimist.nix
+- AMD Threadripper workstation
+- ZFS configuration (hostId: 8425e349)
+- Additional ports: 9091 (Transmission RPC)
+
+### network-sleeper-service.nix  
+- Xeon file server
+- Headless server configuration
+- Ready for additional file sharing service ports
+
+## Usage
+
+Each machine configuration imports its specific network module:
+
+```nix
+# In machines/<machine-name>/configuration.nix
+imports = [
+  ../../modules/network/network-<machine-name>.nix
+  # ... other imports
+];
+```
+
+## Adding New Machines
+
+1. Create `network-<new-machine>.nix` in this directory
+2. Import `./common.nix` for shared settings
+3. Add machine-specific configuration (hostname, hostId, ports)
+4. Import the new file in the machine's `configuration.nix`
+
+## Future Refactoring
+
+The `common.nix` file can be extended to include more shared networking patterns as they emerge across machines. Consider moving repeated patterns here to reduce duplication.