add build documentation for win64

add documentation howto install all dependencies and compile with VS2017

README.md

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 ```
+## Compile for Windows
+
+- see [WINCOMPILE.md](WINCOMPILE.md)
 
 ## Compile on Linux 
 

WINCOMPILE.md

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+# Compile **xmr-stak** for Windows
+
+## Install Dependencies
+
+### Preparation
+
+- open a command line `cmd`
+- run `mkdir C:\xmr-stak-dep`
+
+### Visual Studio 2017 Community
+
+- download VS2017 Community and install from [https://www.visualstudio.com/downloads/](https://www.visualstudio.com/downloads/)
+- during the install chose the components
+  - `Desktop development with C++` (left side)
+  - `Toolset for Visual Studio C++ 2015.3 v140...` (left side)
+
+### CMake for Win64
+
+- download and install the latest version from [https://cmake.org/download/](https://cmake.org/download/)
+- tested version: [cmake 3.9](https://cmake.org/files/v3.9/cmake-3.9.0-rc3-win64-x64.msi)
+- during the install choose the option `Add CMake to the system PATH for all users`
+
+### OpenSSL for Win64
+
+- download and install the precompiled binary form [https://slproweb.com/products/Win32OpenSSL.html](https://slproweb.com/products/Win32OpenSSL.html)
+- tested version: [OpenSSL 1.0.2L](https://slproweb.com/download/Win64OpenSSL-1_0_2L.exe)
+
+### Hwloc for Win64
+
+- download the precompiled binary from [https://www.open-mpi.org/software/hwloc/v1.11/](https://www.open-mpi.org/software/hwloc/v1.11/)
+- tested version: [hwloc-win64-build-1.11.7](https://www.open-mpi.org/software/hwloc/v1.11/downloads/hwloc-win64-build-1.11.7.zip)
+- unzip hwloc to `C:\xmr-stak-dep`
+
+### Microhttpd for Win32
+
+- download the precompiled binary from [http://ftpmirror.gnu.org/libmicrohttpd/](http://ftpmirror.gnu.org/libmicrohttpd/)
+- tested version: [microhttpd-0.9.55](http://mirror.reismil.ch/gnu/libmicrohttpd/libmicrohttpd-0.9.55-w32-bin.zip)
+- unzip microhttpd to ``C:\xmr-stak-dep`
+
+### Validate the Dependency Folder
+
+- open a command line `cmd`
+- run
+   ```
+   cd c:\xmr-stak-dep
+   tree
+   ```
+- the result should have the same structure
+  ```
+    C:\XMR-STAK-DEP
+    ├───hwloc-win64-build-1.11.7
+    │   ├───bin
+    │   ├───include
+    │   │   └───hwloc
+    │   │       └───autogen
+    │   ├───lib
+    │   │   └───pkgconfig
+    │   └───share
+    │       ├───doc
+    │       │   └───hwloc
+    │       ├───hwloc
+    │       └───man
+    │           ├───man1
+    │           ├───man3
+    │           └───man7
+    └───microhttpd
+  ```
+
+## Compile
+
+- download and unzip `xmr-stak-cpu`
+- open a command line `cmd`
+- goto your unzipped source code
+- run (the path to VS2017 can be differ)
+  ```
+  "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\Tools\VsMSBuildCmd.bat"
+  set CMAKE_PREFIX_PATH=C:\xmr-stak-dep\hwloc-win64-build-1.11.7;C:\xmr-stak-dep\microhttpd
+  mkdir build
+  cd build
+  cmake -G "Visual Studio 15 2017 Win64" -T v141,host=x64 ..
+  msbuild xmr-stak-cpu.sln /p:Configuration=Release
+  cd bin\Release
+  copy C:\xmr-stak-dep\hwloc-win64-build-1.11.7\bin\libhwloc-5.dll .
+  copy ..\..\..\config.txt .
+  ```
+- add the pool, pool-password and pool-username to `config.txt`