Add list of recommended reading to README

[stephlocke]

Add a links section that enables people new to using ML Services read up on the SQL they need to know, the R/Python/Java integration etc, and other useful resources that will help them work on this project.

[ananthshenoy]

Hi @stephlocke. I am interested to work on this issue. Are you expecting a new section in README with name Recommended Reading and sections below them?

[stephlocke]

Sounds perfect - make it so @ananthshenoy! 👏