add service manager sal

service_manager/README.md

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+# Service Manager
+
+This crate provides a unified interface for managing system services across different platforms.
+It abstracts the underlying service management system (like `launchctl` on macOS or `systemd` on Linux),
+allowing you to start, stop, and monitor services with a consistent API.
+
+## Features
+
+- A `ServiceManager` trait defining a common interface for service operations.
+- Platform-specific implementations for:
+  - macOS (`launchctl`)
+  - Linux (`systemd`)
+- A factory function `create_service_manager` that returns the appropriate manager for the current platform.
+
+## Usage
+
+Add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+service_manager = { path = "../service_manager" }
+```
+
+Here is an example of how to use the `ServiceManager`:
+
+```rust,no_run
+use service_manager::{create_service_manager, ServiceConfig};
+use std::collections::HashMap;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let service_manager = create_service_manager();
+
+    let config = ServiceConfig {
+        name: "my-service".to_string(),
+        binary_path: "/usr/local/bin/my-service-executable".to_string(),
+        args: vec!["--config".to_string(), "/etc/my-service.conf".to_string()],
+        working_directory: Some("/var/tmp".to_string()),
+        environment: HashMap::new(),
+        auto_restart: true,
+    };
+
+    // Start a new service
+    service_manager.start(&config)?;
+
+    // Get the status of the service
+    let status = service_manager.status("my-service")?;
+    println!("Service status: {:?}", status);
+
+    // Stop the service
+    service_manager.stop("my-service")?;
+
+    Ok(())
+}
+```