Update README.md

Author: stefnotch

README.md

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 # Unit Testing Plugin for the FlaxEngine
 
+A simple unit testing plugin for the FlaxEngine. 
+
+## Installation
+To install it, simply download [the latest release](https://github.com/FlaxCommunityProjects/FlaxUnitTesting/releases) and unpack it into your `Content` folder.
+
+## Example
+[The ExampleClass.cs](https://github.com/FlaxCommunityProjects/FlaxUnitTesting/blob/master/Source/Editor/ExampleClass.cs) contains a simple example of how to write unit tests with this plugin.