Update Readme with installation instructions

Thanks, will fix.
On Nov 18, 2014 12:18 PM, "paul.s" <notifications@github.com> wrote:

> In README.md:
>
> > @@ -52,6 +52,14 @@ See [Parallelizing Test Runs](#parallelizing-test-runs) for more info.
> >  * You'll need Xcode's Command Line Tools installed.  From Xcode, install
> >  via _Xcode &rarr; Preferences &rarr; Downloads_.
> >
> > +## Installation
> > +
> > +xctool can be installed from homebrew via
> > +```
> > +brew install xctool
> > +```
> > +
> > +or can be downloaded and run vai the xctool.sh command.
>
> misspelled via
>
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> <https://github.com/facebook/xctool/pull/446/files#r20534861>.
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