Document how to install a dependency

[danthareja]

Closes #217

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[hnordt]

The generated project only includes build dependencies.

Because npm install --save <library-name> is considered a build dependency too the above sentence looks confusing to me.

Also I consider React and ReactDOM as project-specific dependencies too.

I would like to suggest a slighty change:

The generated project includes React and ReactDOM as dependencies and Create React App as a development dependency. Other dependencies (Redux, React Router, etc.) can be installed with npm, without having to modify any existing configuration.

[danthareja]

Good point about React and ReactDOM also being dependencies. I like the explicitness of your copy, thanks for the suggestion!

[gaearon]

Let’s change it to:

The generated project includes React and ReactDOM as dependencies. It also includes a set of scripts used by Create React App as a development dependency.

[gaearon]

Let’s avoid passive and trim the sentence down :

You may install other dependencies (for example, React Router) with npm:

[danthareja]

Good suggestions - thanks!

[danthareja]

Bump @gaearon

[mxstbr]

This looks good, thanks @danthareja!