Add build instructions

README.md

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+# ASP.NET Core Module
+
+The ASP.NET Core Module is an IIS Module which is responsible for process
+management of ASP.NET Core http listeners and to proxy requests to the process
+that it manages.
+
+## Pre-requisites for building
+
+### Windows 8.1+ or Windows Server 2012 R2+
+
+### Visual C++ Build Tools
+
+[Download](http://download.microsoft.com/download/D/2/3/D23F4D0F-BA2D-4600-8725-6CCECEA05196/vs_community_ENU.exe)
+and install Visual Studio 2015. In Visual Studio 2015 C++ tooling is no longer
+installed by default, you must chose "Custom" install and select Visual C++.
+
+![Visual C++](https://cloud.githubusercontent.com/assets/4734691/18014419/b06e589a-6b77-11e6-9393-4eed32186ca3.png)
+
+Optionally, if you don't want to install Visual Studio you can just install the
+[Visual C++ build tools](http://landinghub.visualstudio.com/visual-cpp-build-tools).
+
+### MSBuild
+
+If you have installed Visual Studio, you should already have MSBuild. If you
+installed the Visual C++ build tools, you will need to download and install
+[Microsoft Build Tools 2015](https://www.microsoft.com/en-us/download/details.aspx?id=48159)
+
+Once you have installed MSBuild, you can add it your path. The default location
+for MSBuild is `%ProgramFiles(x86)%\MSBuild\14.0\Bin`
+
+### Windows Software Development Kit for Windows 8.1
+
+[Download](http://download.microsoft.com/download/B/0/C/B0C80BA3-8AD6-4958-810B-6882485230B5/standalonesdk/sdksetup.exe)
+and install the Windows SDK for Windows 8.1. From the Feature list presented,
+ensure you select *Windows Software Development Kit*.
+
+If chose to install from the command prompt, you can run the following command.
+````
+.\sdksetup.exe /features OptionId.WindowsDesktopSoftwareDevelopmentKit
+````
+
+## How to build
+
+
+```powershell
+
+# Clean
+.\build.cmd /target:clean
+
+# Build
+.\build.cmd
+
+# Build 64-bit
+.\build.cmd /property:platform=x64
+
+# Build in Release Configuration
+.\build.cmd /property:configuration=release
+```