Added required step into GETTING_STARTED.md file that is telling to S…

[ghost]

Added this required step where user have to tell to System loader where Angular Material2 is located.

[jelbourn]

Configuring SystemJS is only necessary if you're using SystemJS. If you're using Webpack (such as with angular-cli) or something like Browserify, RequireJS etc., this isn't necessary.

I'm okay with adding something on SystemJS since the angular quickstart uses it, but it should be further down (since not all projects use it). I'd put it as something like:

## Configuring SystemJS
If your project is using SystemJS for module loading, you will need to add `@angular/material` to the SystemJS configuration:
System.config({
  // existing configuration options
  map: {
    ...,
    '@angular/material': 'npm:@angular/material/material.umd.js'
  }
});

[ghost]

@jelbourn Thank you. I think that would be a good addition to getting started file, because there are lots of beginners who would use Systemjs with their Angular 2 application. That is also good description that you have added in code below. So let's go with it.

[jelbourn]

@amiral84 are you going to make the recommended changes in the PR?

[ghost]

@jelbourn yes I will make it today as soon as possible.

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[ghost]

@jelbourn now it is updated. :)

[ghost]

@googlebot I signed it!

[googlebot]

CLAs look good, thanks!

[jelbourn]

Can you move this section below ### Additional setup for md-slide-toggleandmd-slider:?

[jelbourn]

LGTM, thanks!

[ghost]

@jelbourn you're welcome :). Hope this will help many.

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