Added build instructions.

Author: Dirk Lemstra

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 2013 (or newer)
+- 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 for x86 and x64
+- Visual C++ MFC for x86 and x64
+- Windows XP support for C++ (optional if the output needs to run on Windows XP)
+
+Nameing of these components might differ between version of Visual Studio. The example above use the Visual Studio
+2017 names.
+
+### Clone the dependencies
+
+The ImageMagick library is build with a number of third party libraries. Run `CloneRepositories.cmd` to clone
+these libraries and the ImageMagick library.
+
+### Build configure.exe
+
+One of the folders that was created in the previous step is called `VisualMagick` and this folder contains a
+folder called `configure`. This folder contains a solution `configure.sln`. Open this solution with Visual Studio
+and start a `Release` build of the project. This will create a file called `configure.exe` in the folder. Running
+this program will start a Wizard that allows configuration of ImageMagick and its individual components.
+
+### Build ImageMagick
+
+Depending on which options where chosen when running `configure.exe` one of the following solutions will be created
+in the `VisualMagick` folder:
+
+- VisualDynamicMT.sln (Dynamic Multi-threaded DLL runtimes)
+- VisualStaticMTD.sln (Static Multi-threaded DLL runtimes)
+- VisualStaticMT.sln (Static Multi-threaded runtimes)
+
+Open the solution to start building ImageMagick. The binaries will be created in the `VisualMagick\bin` folder.