Front page is not nice

[ajaynshah]

https://github.com/xKDR/eventstudies is not a good front page for the package.

(In general, I dislike most front pages on github, so this could just be me). But if we had to show a one page to a prospective user, it would not be this.

We have citations -- https://scholar.google.com/scholar?cites=15232508038484313390&as_sdt=2005&sciodt=0,5&hl=en and https://scholar.google.com/scholar?cites=332369116181392410&as_sdt=2005&sciodt=0,5&hl=en , these need to be shown or linked on the front page.