Merge pull request #46 from LLNL/add-logo

Add Quandary logo

Author: steffi7574

README.md

@@ -1,4 +1,7 @@
-# Quandary - Optimal control for open and closed quantum systems
+# <img src="/quandary_logo/quandary-logo_logo-inline-color.png" width="512" alt="Quandary"/>
+[![Build and Test](https://github.com/LLNL/quandary/actions/workflows/test.yml/badge.svg)](https://github.com/LLNL/quandary/actions/workflows/test.yml)
+
+# Optimal control for open and closed quantum systems
 Quandary simulates and optimizes the time evolution of closed and open quantum systems, given a Hamiltonian that models driven superconducting quantum devices. The
 underlying dynamics are modelled by either Schroedinger's equation (closed systems, state vector), or Lindblad's master equation (open systems, density matrix). Quandary solves the respective ordinary differential equation (ODE) numerically by applying a time-stepping integration scheme, and applies a gradient-based optimization scheme to design optimal control pulses that drive the quantum system to desired targets.
 The target can be a unitary gate, i.e. optimizing for pulses that