Tips for a README

Please consider adding this resource to the README exercise
[nice tips](https://medium.com/@meakaakka/a-beginners-guide-to-writing-a-kickass-readme-7ac01da88ab3) to episode [make it public](https://github.com/SoftDev4Research/4OSS-lesson/blob/gh-pages/_episodes/02-make-it-public.md).
