Hybrid projects

# Including CSS best practices for Hybrid App projects

Status: **Up For Review**

Reviewers: @kpeatt @rosshojo @jeffkamo @mobifydave @jansepar 
JIRA: https://mobify.atlassian.net/browse/GOLD-1164

## Changes
- Initialized new page in the css code styles and filled in what we currently have established as best practices.
Well it seems like an efficient way to utilize the cascade and keep the different projects somewhat separate. I only had android.css in there to illustrate an example, I'll put iOS in there as well to avoid any confusion.