docs(gettingStarted): add Yarn install (jestjs#3588)

* docs(gettingStarted): add Yarn install cc @cpojer * Update GettingStarted.md
tushardhole · May 17, 2017 · 922a134 · 922a134
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commit 922a134
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diff --git a/docs/en/GettingStarted.md b/docs/en/GettingStarted.md
@@ -13,6 +13,12 @@ Install Jest using `npm`:
 npm install --save-dev jest
 ```
 
+Or via [`yarn`](https://yarnpkg.com/en/package/jest):
+
+```
+yarn add --dev jest
+```
+
 Let's get started by writing a test for a hypothetical function that adds two numbers. First, create a `sum.js` file:
 
 ```javascript