Contributing instructions step two (facebook#160)

* Move setup instructions to CONTRIBUTING.md

* Reword setup instructions slightly

Author: mxstbr

Diff for: CONTRIBUTING.md

@@ -22,6 +22,21 @@ Please **ask first** is somebody else is already working on this or the core dev
 
 Please also provide a **test plan**, i.e. specify how you verified what you added works.
 
+## Setting up a local copy of the repository
 
+1. Clone the repo with `git clone https://github.com/facebookincubator/create-react-app`
+
+2. Run `npm install` in the root `create-react-app` folder **and** the `create-react-app/global-cli` folder
+
+Once it is done, you can modify any file locally and run `npm start` or `npm run build` just like in a generated project.
+
+If you want to try out the end-to-end flow with the global CLI, you can do this too:
+
+```
+npm run create-react-app my-app
+cd my-app
+```
+
+and then run `npm start` or `npm run build`.
 
 *Many thanks to [h5bp](https://github.com/h5bp/html5-boilerplate/blob/master/CONTRIBUTING.md) for the inspiration with this contributing guide*

Diff for: README.md

@@ -146,17 +146,7 @@ All of them are transient dependencies of the provided npm package.
 
 ## Contributing
 
-Clone the repo and run `npm install` in the root and the `global-cli` folder.
-
-Once it is done, you can modify any file locally and run `npm start` or `npm run build` just like in a generated project.
-If you want to try out the end-to-end flow with the global CLI, you can do this too:
-
-```
-npm run create-react-app my-app
-cd my-app
-```
-
-and then run `npm start` or `npm run build`.
+We'd love to have your helping hand on `create-react-app`! See [CONTRIBUTING.md](CONTRIBUTING.md) for more information on what we're looking for and how to get started.
 
 ## Acknowledgements