doc: Update README

Update README.

README.md

@@ -1,2 +1,12 @@
 # PyInstallerRunner
 This repo is a tool that can load configuration file to use `PyInstaller` to build python code as an executable file.
+
+## Requirments
+This repo uses `Python 3.x` to develop, so you must install python `3.x` or later version.
+
+This repo need use `pytest` for unit test, so you should use these commands to install necessary modules:
+```sh
+$ pip3 install pytest
+$ pip3 install pytest-cov
+$ pip3 install pytest-mock
+```