Add Python bindings for simple_executor
This pull request contains Python bindings for simple_executor, installation instructions to build and install the Python module via pip, and a toy example written in Python.
Co-Authors in alphabetical order:
Matt Ferrera msferrer@buffalo.edu
Raman Ghimire ramanghi@buffalo.edu
Shriram Ravi shriramr@buffalo.edu
Edited by Matt Ferrera