Adding new tutorial/quickstart content

[StoicLoofah]

@miguelgondu wrote this fantastic tutorial on using sc2reader

https://miguelgondu.github.io/python/ai/video%20games/2018/09/04/a-tutorial-on-sc2reader-events-and-units.html

I want to integrate this more directly into the documentation around, but I'm not quite sure where to wedge it in amongst the README, GitHub wiki, docs, etc.

What do you guys think?

[miguelgondu]

I could also provide it as a markdown file. Thanks for taking it into consideration.

[dneise]

I think it would be already very good to put a link to the blog post into the README.

[miguelgondu]

Unfortunately I migrated my blog, but the blogpost is still available in case anyone's interested!

https://www.miguelgondu.com/blogposts/2018-09-03/a-tutorial-on-sc2reader-events-and-units/