Initial tag of python library pwr.py

To install:

(Python 2)
python2 -m pip install "git+https://github.com/intel/[email protected]#egg=pwr&subdirectory=pwr"

(Python 3)
python3 -m pip install "git+https://github.com/intel/[email protected]#egg=pwr&subdirectory=pwr"

If non-root, add sudo -H before each command.