Add basic README

tests/dotnetexample/README.md

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+## .Net example
+
+This assumes that you have a ``MSBuild`` executable on your `PATH`.
+
+Currently this is setup to build the full ASP.NET MVC repo.
+It is a great testcase,
+but is probably a bit large for production tests.
+
+We don't have the checkout in the repo,
+but there's a ``clone.sh`` in the ``example`` directory which will clone it properly.