add doc for qiskit interface setup

Author: uuudown

qiskit/README.md

@@ -0,0 +1,25 @@
+## Install the Python Qiskit interface
+
+1) Setup the Python environment, we need Python>=3.6. It is recommended to use conda for the setup.
+
+2) Install the importlib_resources package for locating the nwqsim lib. 
+```bash
+pip install importlib_resources
+```
+
+3) Build the package
+```bash
+python setup build
+```
+
+4) Install the package
+```bash
+python setup install
+```
+
+5) Test the setup
+```bash
+python ghz.py
+```
+
+Please find how to call the simulator in the examplar ghz.py.