Add device model information to documentation and usage examples

Author: ysdragon

README.md

@@ -17,6 +17,7 @@ SysInfo is a powerful Ring package that provides easy access to essential system
 ## Features
 
 ### Core System Info
+- Device model
 - System hostname and username
 - OS name and kernel version
 - CPU model, cores, and usage metrics

docs/API.md

@@ -22,6 +22,10 @@ For more examples and detailed usage instructions, see the [Usage Guide](./Usage
 
 The `SysInfo` class provides the following public methods:
 
+### `model()`
+Retrieves the device model.
+- **Returns**: `String` - The device model (e.g., "MacBookPro18,1", "Surface Pro 9").
+
 ### `hostname()`
 Retrieves the system's hostname.
 - **Returns**: `String` - The hostname.

docs/Usage.md

@@ -15,6 +15,10 @@ Now, you can use the `sys` object to call various methods to fetch system inform
 Here's how to get some of the most common system details:
 
 ```ring
+// Get Device Model
+model = sys.model()
+? "Device Model: " + model
+
 // Get OS Information
 osDetails = sys.os()
 osName = osDetails[:name]  // e.g., "Void Linux"