Updated README
 I have updated the README with the following - 
1. Added Links for Conda, Cython and AQR.
2. Added a brief description for what all the Dependencies do so people who are unfamiliar with them can atleast get a basic idea about them
3. Corrected PyPI spelling in one instance
Hey
If any more changes are needed in the README just comment them below I'll do them as well.
Thanks :) I can't seem to understand why it failed. I think it is unrelated to my changes @jreback Just wanted to mention I've made the changes but some tests seem to fail however I think they are independent of my changes thanks @aflah02 failures are unrelated to your PR