PR: Add and example + Documentation and Installation section

[jnsebgosselin]

Fixes #6

• [x] Add the required input files to run an example
• [x] Add an example section
• [x] Add an installation section

[pep8speaks]

Hello @jnsebgosselin! Thanks for submitting the PR.

• There are no PEP8 issues in the file pyhelp/managers.py !

• There are no PEP8 issues in the file pyhelp/processing.py !