Add initial README for SnapRAID AIO Nix package with installation and configuration details

readme.md

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+# SnapRAID AIO Nix
+
+A NixOS package and module for the [SnapRAID AIO Script](https://github.com/auanasgheps/snapraid-aio-script) - the definitive all-in-one SnapRAID helper script for Linux.
+
+## Overview
+
+This package provides a properly Nix-integrated version of the SnapRAID AIO script, which automates SnapRAID operations with features like:
+
+- Automated sync operations with safety checks
+- Configurable scrub capabilities
+- Email notifications
+- Discord, Telegram, Pushover notifications via Apprise
+- Smart drive monitoring
+- Robust logging
+
+All dependencies are properly managed through Nix, and the script is patched to work correctly within the NixOS environment.
+
+## Installation
+
+### As a NixOS Module
+
+Add to your flake.nix:
+
+```nix
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    snapraid-aio = {
+      url = "github:Tophc7/snapraid-aio.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = { self, nixpkgs, snapraid-aio, ... }: {
+    # For NixOS system configuration
+    nixosConfigurations.<yourhostname> = nixpkgs.lib.nixosSystem {
+      # ...
+      modules = [
+        snapraid-aio.nixosModules.default
+        # ...
+        ({ ... }: {
+          # Configure the service
+          services.snapraid-aio = {
+            enable = true;
+            # Optional custom config file
+            configFile = "/path/to/your/snapraid-aio.conf";
+            # Optional schedule
+            schedule = "daily";
+          };
+        })
+      ];
+    };
+  };
+}
+```
+
+## Configuration
+
+### NixOS Module Options
+
+| Option | Type | Default | Description |
+|--------|------|---------|-------------|
+| `enable` | boolean | `false` | Enable the snapraid-aio service |
+| `configFile` | null or path | `null` | Path to custom configuration file (if null, uses default config) |
+| `schedule` | null or string | `null` | Systemd calendar expression for scheduling (e.g., "daily" or "Mon,Thu 03:00"). If null, timer won't be enabled |
+
+### Custom Configuration
+
+You can create a custom configuration file based on the [original template](https://github.com/auanasgheps/snapraid-aio-script/blob/a46c7362af385eac945e86a2a0f6097dbe7ca3fb/script-config.conf). The following settings have been modified in the Nix wrapper:
+
+- `PATH` is managed by the Nix wrapper (any PATH setting in config will be ignored)
+- Paths to binaries like `apprise` are automatically handled by Nix
+
+## Usage
+
+### Manual Execution
+
+```bash
+# Run with default config
+snapraid-aio
+
+# Run with custom config
+snapraid-aio /path/to/config.conf
+```
+
+### Scheduled Execution
+
+When enabled via NixOS module with a schedule, the service will run automatically according to the schedule. You can also trigger it manually:
+
+```bash
+# Run the service manually
+sudo systemctl start snapraid-aio.service
+
+# Check status
+sudo systemctl status snapraid-aio.service
+
+# View logs
+sudo journalctl -u snapraid-aio.service
+```
+
+## Technical Details
+
+This Nix package:
+
+1. Properly patches the snapraid-aio script to work within NixOS
+2. Manages all dependencies through Nix
+3. Provides PATH protection to prevent the script from overriding critical environment variables
+4. Sets up proper temporary directories for logs and state files
+5. Configures systemd services and timers for scheduled operation
+6. Fixes various hardcoded paths in the original script
+
+The script uses a multi-layered approach to ensure correct operation:
+- Custom wrapper script with explicit PATH setting
+- PATH protection in the main script
+- wrapProgram for additional dependency management
+
+## License
+
+This Nix package is released under MIT. The original snapraid-aio script is under GPL-3.0 license.