Write a compelling README

[ao5357]

Write a readme file that exemplifies what this cool repo is all about

[aditya28sarin]

Can you assign this issue to me?

[ao5357]

@aditya28sarin thanks!

You could probably swipe quite a bit from https://github.com/lowerbarriers/finished-starter/blob/gh-pages/readme.md

organization-starter differs from finished-starter in that it focuses on the content and components that nonprofit organizations can use.