Add docs for getting started with fubu new

Here are some notes I took while setting up a new application with the `fubu` gem. I included some options because I had a little bit of friction getting started that I thought other newcomers may face:
* having to restart the shell in Admin mode after Katana failed to start
* not having any view option by default or knowing how to add one
* wondering why it was set to .NET v4.0
* having the solution built by default in 2012, which requires some minor tweaks to work in 2013

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What do you think about moving this section before the introduction? I may be in the minority, but I heard about FubuMVC through word of mouth. I was already sold on trying to build something with it by the time I was looking for docs -- *getting started* was the first thing I wanted to find.