Added a few examples to the README

[Breza]

No description provided.

[maelle]

Thanks @Breza!

• I am working on repairing the build on master.

• I think issue add use cases to a section of the README #26 was misleading, it was about use cases such as blog posts so this PR is independent from it in the end.

• It's fine and useful to add examples like you did though. But could you please add a README.Rmd so that README.md contains the output? Example of README.Rmd https://github.com/lockedata/datasauRus/blob/master/README.Rmd (so you can see what the top of the file looks like)

• When you're done, please add yourself as contributor "ctb". I'd recommend installing whoami and desc and then run desc::desc_add_me().