Added installation instructions to readme and fixed typos

Hi

Thanks for making this bundle, it's awesome! I've tweaked your readme to include installation instructions (for Composer, based on another of your bundles) and I've fixed a couple of typos.

Feel free to ignore this if you don't want to make any changes!

Cheers,
Al
Merge pull request #1 from eggfriedrice/patch-1

Added installation instructions to readme and fixed typos