Create FileParse.csx

[ocvist]

Simple example of XML file parse script.

[ocvist]

This was something I created after listening to .Net Rocks podcast on the way to work on ScriptCS. It's something I will probably use at work. I figured I'd share.

[adamralph]

Hi @ocvist, thanks for raising this PR.

For it to be a self contained sample, it would have to contain the sample XML file. Do you think you could include it? When someone clones this repo, they should be able to run your sample in a very simple manner. The sample folder (XML) should also contain a README.md file which explains how to run the sample.

[ocvist]

Done.