Add sphinx and contribution guide to documentation

[petarnikolovski]

Hi. I've added basic documentation with Sphinx. So far, introduction is mostly copied from README to sphinx docs. The novelty here is a short contribution guide which covers:

• How to fork/clone project
• Install dependencies
• General work-flow with git

If you want to see the documentation, pip install sphinx, and then cd into docs and use make html. index.html will be located in the _build directory.

[codecov]

Codecov Report

Merging #64 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #64   +/-   ##
=======================================
  Coverage   85.88%   85.88%           
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  Files          16       16           
  Lines         659      659           
  Branches      115      115           
=======================================
  Hits          566      566           
  Misses         74       74           
  Partials       19       19

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[ryanhiebert]

Looks good, thank you for putting in the work to make this happen. Just a couple small errors that I'm sure you'll want to clean up before we merge it.

[ryanhiebert]

To the code base

[ryanhiebert]

setup.py

[petarnikolovski]

Thanks for taking time to review. I'll make changes later, and I'll also change few commands in the contribution instruction guide to match changes when Pipfile is added to the project.

[petarnikolovski]

I've fixed the typo and the missing article. However, I haven't yet updated the contribution process. I'll do that when I finally setup Pipfile (I have some problems with tox as I've described on issue #65).