Added readme.md

Author: dlemstra

readme.md

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+# Building ImageMagick on Windows.
+
+This document describes the requirements and instructions to build ImageMagick for Windows on your own machine.
+
+### Requirements
+
+- Visual Studio (preferably the latest version)
+- Git for Windows
+- AMD APP SDK (optional for OpenCL support)
+
+### Install Visual Studio dependencies
+
+To build ImageMagick with Visual Studio the following components should be installed:
+
+- Desktop development with C++ (workload)
+- Visual C++ ATL build tools
+- Visual C++ MFC build tools
+
+Naming of these components might differ between versions of Visual Studio.
+
+### Clone the dependencies
+
+The ImageMagick library is built with a number of third party libraries. Run `clone-repositories-im7.cmd` to clone
+these libraries and the ImageMagick library. To clone the legacy ImageMagick 6 library and it's dependencies
+run `clone-repositories-im6.cmd`.
+
+### Build Configure.exe
+
+One of the folders in this project is called `Configure`. This folder contains the solution file `Configure.sln` that
+is compatible with the latest version of Visual Studio. Open this solution file in Visual Studio and build the
+`Configure` project. This will create the `Configure` executable in the `Configure/Artifacts` folder. Running this
+program will start a Wizard that allows configuration of ImageMagick and its individual components.
+
+### Build ImageMagick
+
+Depending on which options were chosen when running `Configure` a solution file will be created in the root folder of
+this project. Open this solution file in Visual Studio to start building ImageMagick. The binaries and libraries will be
+created in the `Artifacts` folder.