Update README.md

Author: BrianMacIntosh

README.md

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 # UnityProjectBrowser
-Standalone Winforms application for browsing references in a Unity project.
+A standalone Winforms application for browsing references in a Unity project.
+
+In the Unity Editor, it's often easy to see which assets and scripts are being used by a particular asset. However, it's much more difficult to see incoming references - which assets are *referencing* that asset. This program performs that function by parsing the entire contents of a Unity project and building a network of references you can browse.
+
+![GitHub Logo](/Screenshots/screenshot000.png)