Add CSS-in-JavaScript section

We have been writing CSS in JavaScript and have developed a set of best practices around this type of thing. I thought it would be nice to publish this document alongside our other JavaScript style guide documents.
npr · Sep 1, 2016 · 71a2b12 · 71a2b12
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diff --git a/README.md b/README.md
@@ -9,6 +9,7 @@
 Other Style Guides
  - [ES5 (Deprecated)](https://github.com/airbnb/javascript/tree/es5-deprecated/es5)
  - [React](react/)
+ - [CSS-in-JavaScript](css-in-javascript/)
  - [CSS & Sass](https://github.com/airbnb/css)
  - [Ruby](https://github.com/airbnb/ruby)
 
@@ -2218,7 +2219,7 @@ Other Style Guides
   - [19.2](#commas--dangling) Additional trailing comma: **Yup.** eslint: [`comma-dangle`](http://eslint.org/docs/rules/comma-dangle.html) jscs: [`requireTrailingComma`](http://jscs.info/rule/requireTrailingComma)
 
     > Why? This leads to cleaner git diffs. Also, transpilers like Babel will remove the additional trailing comma in the transpiled code which means you don't have to worry about the [trailing comma problem](es5/README.md#commas) in legacy browsers.
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     ```javascript
     // bad - git diff without trailing comma
     const hero = {