added pyside to gui

Author: Sakth1

README.md

@@ -568,6 +568,7 @@ _Libraries for working with graphical user interface applications._
 - [pyglet](https://github.com/pyglet/pyglet) - A cross-platform windowing and multimedia library for Python.
 - [PyGObject](https://pygobject.readthedocs.io/) - Python Bindings for GLib/GObject/GIO/GTK+ (GTK+3).
 - [PyQt](https://doc.qt.io/qtforpython/) - Python bindings for the [Qt](https://www.qt.io/) cross-platform application and UI framework.
+- [PySide](https://doc.qt.io/qtforpython/) - Qt for Python offers the official Python bindings for [Qt](https://www.qt.io/), same as PyQt but this is the official binding.
 - [pywebview](https://github.com/r0x0r/pywebview/) - A lightweight cross-platform native wrapper around a webview component.
 - [Tkinter](https://wiki.python.org/moin/TkInter) - Tkinter is Python's de-facto standard GUI package.
 - [Toga](https://github.com/pybee/toga) - A Python native, OS native GUI toolkit.