Improve "Getting started" section in the README #15
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Super trivial changes, I removed some ignored files that you probably accidentally checked in and expanded the getting started section a bit. I've never used Firebase before so it was a bit of a struggle (and some Googling) to get it running. I've added some extra documentation for that (also included some Android specific bits) which should make this step a bit easier for someone else who has never done any Firebase stuff before :).