Added build instructions

readme.md

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+WinCDEmu Build Instructions
+===========================
+
+0. Checkout WinCDEmu (https://github.com/sysprogs/WinCDEmu), BazisLib (https://github.com/sysprogs/BazisLib) and STLPort-kernel (https://github.com/sysprogs/stlport-kernel) to a common directory.
+0. Set the BZSLIB_PATH environment variable to point at the BazisLib directory
+0. Set the STLPORT_PATH environment variable to point at the STLPort directory
+0. Install WDK 7.x and set the WDK7PATH environment variable to point at it
+0. Download/unpack WTL 8.0 and set WTL_PATH to point at it
+0. Open WinCDEmu.sln in Visual Studio 2010-2015
+0. Build the kernel-mode release configurations and then the user-mode release configurations
+0. The binaries will be saved to AllModules