Added dev environment setup information for clarity

Author: kiddailey

README.md

@@ -63,6 +63,17 @@ ASPNetImage is a work in progress and any help completing the object is apprecia
   * *SaveImage*<br />_Partially implemented._ Saves the image, but currently only in JPEG format.
 
 
+# Environment Configuration
+
+* Visual Studio 2010 or greater
+
+* Install and configure NUnit.  TestDriven.NET, which provides NUnit is available at http://testdriven.net/  You will need to add a reference to "nunit.framework" in the UnitTests project.
+
+* Configure DLL signing.  In Visual Studio, open the ASPNetImage project properties and click on the "Signing" tab.  Check the box labeled "Sign the assembly" and select "< New >" from the "Choose a strong name key file:" dropdown and follow the prompts.
+
+* You should be able to build the DLL and run the unit tests at this point.
+
+
 # Troubleshooting
 
 **Installation Issues**