update readme

Author: sandyherho

README.md

@@ -1,6 +1,7 @@
 # Simple Idealized 1D NLSE Solver
-
+[![Python](https://img.shields.io/badge/python-3.8%2B-blue.svg)](https://www.python.org/downloads/)
 [![License: WTFPL](https://img.shields.io/badge/License-WTFPL-brightgreen.svg)](http://www.wtfpl.net/about/)
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
 
 A flexible and efficient solver for the 1D Nonlinear Schrödinger Equation (NLSE)