Updated to include need for Powershell 3.0

Author: wwahammy

README.md

@@ -10,11 +10,16 @@ Features include:
 * Cmdlets for signing files and administering the service
 * MSBuild tasks and targets for integrating signing into your build process
 
-###Requirements
+###Requirements for usage
+* Powershell 3.0
+  * Included with Windows 8, for [Windows 7 64-bit](http://download.microsoft.com/download/E/7/6/E76850B8-DA6E-4FF5-8CCE-A24FC513FD16/Windows6.1-KB2506143-x64.msu) or [32-bit](http://download.microsoft.com/download/E/7/6/E76850B8-DA6E-4FF5-8CCE-A24FC513FD16/Windows6.1-KB2506143-x86.msu)
+
+###Development Requirements
 * Visual Studio 2012 (Visual Studio 2010 SP1 will probably work)
 * [Wix 3.7](http://wix.codeplex.com/releases/view/99514)
 * Azure Storage Emulator
   * For [VS2012](http://go.microsoft.com/fwlink/?linkid=254364&clcid=0x409) or [VS2010](http://go.microsoft.com/fwlink/?linkid=254269&clcid=0x409)
+* Plus all the usage requirements above
 
 ###Folder Structure
 * _[ClientLib](https://github.com/outercurve/SigningService/tree/master/ClientLib)_