add normal user restrictions

session_manager.h

@@ -12,6 +12,7 @@ public:
   session_manager(conexion* con);
   conexion* con;
   bool loggin(std::string username, std::string passwd);
+  bool admin();
   int install_command(std::string package);
   int remove_command(std::string package);
   std::list<std::string> get_packages_info();