Update README.md

Author: ye-luo

README.md

@@ -3,3 +3,5 @@ pw2qmcpack converts the DFT orbitals calculated by [Quantum ESPRESSO](https://ww
 
 Users should not build the source code of this repository directly but build QE via CMake with the option `-DQE_ENABLE_PLUGINS=pw2qmcpack` added.
 We don't support enabling pw2qmcpack in QE configure script.
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+[![ci-qe](https://github.com/QMCPACK/pw2qmcpack/actions/workflows/ci-github-actions.yaml/badge.svg)](https://github.com/QMCPACK/pw2qmcpack/actions/workflows/ci-github-actions.yaml)