Fix indentation issues in PHP files

- Fixed tabs vs spaces indentation issues in PHP files
- Updated phpcs.xml configuration

includes/class-plugin.php

@@ -14,51 +14,51 @@ use WPALLSTARS\PluginStarterTemplate\Admin\Admin;
  */
 class Plugin {
 
-	/**
-	 * Core instance
-	 *
-	 * @var Core
-	 */
-	private $core;
+    /**
+     * Core instance
+     *
+     * @var Core
+     */
+    private $core;
 
-	/**
-	 * Admin instance
-	 *
-	 * @var Admin
-	 */
-	private $admin;
+    /**
+     * Admin instance
+     *
+     * @var Admin
+     */
+    private $admin;
 
-	/**
-	 * Plugin file
-	 *
-	 * @var string
-	 */
-	private $plugin_file;
+    /**
+     * Plugin file
+     *
+     * @var string
+     */
+    private $plugin_file;
 
-	/**
-	 * Plugin version
-	 *
-	 * @var string
-	 */
-	private $version;
+    /**
+     * Plugin version
+     *
+     * @var string
+     */
+    private $version;
 
-	/**
-	 * Constructor
-	 *
-	 * @param string $plugin_file Main plugin file path.
-	 * @param string $version Plugin version.
-	 */
-	public function __construct( $plugin_file, $version ) {
-		$this->plugin_file = $plugin_file;
-		$this->version     = $version;
-		$this->core        = new Core( $version );
-		$this->admin       = new Admin( $this->core );
-	}
+    /**
+     * Constructor
+     *
+     * @param string $plugin_file Main plugin file path.
+     * @param string $version Plugin version.
+     */
+    public function __construct( $plugin_file, $version ) {
+        $this->plugin_file = $plugin_file;
+        $this->version = $version;
+        $this->core = new Core( $version );
+        $this->admin = new Admin( $this->core );
+    }
 
-	/**
-	 * Initialize the plugin
-	 */
-	public function init() {
-		// Initialization logic goes here.
-	}
+    /**
+     * Initialize the plugin
+     */
+    public function init() {
+        // Initialization logic goes here.
+    }
 }