Add new views and styles for music application

- Created new CSS files for styling the application, including home.css and style.css.
- Implemented 403 and 404 error views with appropriate messages and navigation.
- Developed a dump view to display deleted elements with restoration options.
- Enhanced home view to include music search functionality and display results.
- Added listplay view for managing music playlists, including creation and deletion options.
- Implemented loadmusic view for uploading new music with necessary fields.
- Created login and register views for user authentication.
- Developed sound view to display individual music tracks with playback controls and options for liking and deleting.
- Updated menu view to include navigation links based on user authentication status.

controller/user/Session.controller.php

@@ -0,0 +1,26 @@
+<?php
+
+session_start();
+
+class Session{
+    public static function Auth(){
+        return isset($_SESSION['LOGIN'])?$_SESSION['LOGIN']:false;
+    }
+
+    public static function Admin(){
+        return isset($_SESSION['privileges'])?$_SESSION['privileges']:false;
+    }
+
+    public static function getUsername(){
+        return isset($_SESSION['username'])?$_SESSION['username']:null;
+    }
+    
+    public static function getUserID(){
+        return isset($_SESSION['idUser'])?$_SESSION['idUser']:0;
+    }
+
+    public static function logout(){
+        unset($_SESSION);
+        session_destroy();
+    }
+}