Update readme with pip install instruction from PyPI

Author: jonathancychow

README.md

@@ -3,6 +3,12 @@
 Basic packages containing all the Python dependencies for the Coder Dojo Sessions.
 
 ## Installation
+You can install the package from PyPI using the following command.
+
+```shell
+'pip install "coder-dojo-common-python[games,data]"
+```
+
 
 You can install the package from GitHub using the following command.