Added best practices rule book for ML from Google

http://martin.zinkevich.org/rules_of_ml/rules_of_ml.pdf

Author: rajeshvaya

README.md

@@ -289,6 +289,7 @@ Each day I take one subject from the list below, read it cover to cover, take no
 ## Resources
 - [ ] [Learn Machine Learning in a Single Month](https://elitedatascience.com/machine-learning-masterclass)
 - [ ] [The Non-Technical Guide to Machine Learning & Artificial Intelligence](https://medium.com/@samdebrule/a-humans-guide-to-machine-learning-e179f43b67a0#.cpzf3a5c0)
+- [ ] [Best practices rule book for Machine Learning engineering from Google](http://martin.zinkevich.org/rules_of_ml/rules_of_ml.pdf)
 - [ ] [Machine Learning for Software Engineers on Hacker News](https://news.ycombinator.com/item?id=12898718)
 - [ ] [Machine Learning for Developers](https://xyclade.github.io/MachineLearning/) 
 - [ ] [Machine Learning Advice for Developers](https://dev.to/thealexlavin/machine-learning-advice-for-developers)