added sample script to build cpp-ethereum libs under Windows (not fully tested)

marketmaker_build_cpp-ethereum.cmd

@@ -0,0 +1,15 @@
+@echo off
+rem Sample script to build cpp-ethereum libs by Decker (don't fully tested yet)
+rem Make sure cpp-ethereum is empty, before run.
+
+git submodule init
+git submodule update --init --recursive
+cd cpp-ethereum
+rem git submodule init
+rem git submodule update --init
+call scripts\install_deps.bat 
+mkdir build_win64_release
+cd build_win64_release
+cmake .. -G "Visual Studio 14 2015 Win64"
+cmake --build . --config Release
+rem cmake --build .