Installation instructions should be clarified to remove tests subfolder from client

[ahokinson]

While updating the submodules to grab the latest client, git pulled in a tests subfolder which won't compile due to namespace issues. It's clear from the code why that is...

using static Math.Foo;
using Task = Fart.Threading.Tasks.Task;
using static Proper.Bar;

Since it is test code from the submodule, it can be safely removed and the plugin works as intended.

I'm not sure how to make a git submodule ignore a specific folder, but perhaps your instructions could indicate that the tests folder should be removed before adding to Unity?

[codeserk]

Good suggestion, I've addd a line in the README for this