Initial setup on appveyor

[ci skip]

README.md

 mtxclient
 ---
 [![Build Status](https://travis-ci.org/mujx/mtxclient.svg?branch=master)](https://travis-ci.org/mujx/mtxclient)
+[![Build status](https://ci.appveyor.com/api/projects/status/5hl7a6dc5s60xpxy/branch/master?svg=true)](https://ci.appveyor.com/project/mujx/mtxclient/branch/master)
 [![codecov](https://codecov.io/gh/mujx/mtxclient/branch/master/graph/badge.svg)](https://codecov.io/gh/mujx/mtxclient)
 
 Client API library for the Matrix protocol, built on top of Boost.Asio.

appveyor.yml

+---
+
+version: 0.1.0-{build}
+
+configuration: Release
+image: Visual Studio 2017
+platform: x64
+
+build:
+    verbosity: minimal
+
+
+install:
+    - set PATH=%PATH%;C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin
+    - mingw32-make.exe --version
+    - call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat"
+    - vcpkg install 
+            openssl:%PLATFORM%-windows 
+            boost-system:%PLATFORM%-windows
+            boost-random:%PLATFORM%-windows 
+            boost-thread:%PLATFORM%-windows 
+            boost-iostreams:%PLATFORM%-windows
+            boost-asio:%PLATFORM%-windows
+            boost-beast:%PLATFORM%-windows
+            libsodium:%PLATFORM%-windows 
+            zlib:%PLATFORM%-windows
+
+build_script:
+    - cmake -G "Visual Studio 15 2017 Win64" -H. -Bbuild
+      -DCMAKE_BUILD_TYPE=Release 
+      -DCMAKE_TOOLCHAIN_FILE=C:/Tools/vcpkg/scripts/buildsystems/vcpkg.cmake
+      -DBUILD_LIB_TESTS=OFF
+      -DBUILD_LIB_EXAMPLES=OFF
+    - cmake --build build --config Release

cmake/Olm.cmake

@@ -7,16 +7,22 @@ include(ExternalProject)
 set(THIRD_PARTY_ROOT ${CMAKE_SOURCE_DIR}/.third-party)
 set(OLM_ROOT ${THIRD_PARTY_ROOT}/olm)
 
+if(MSVC)
+    set(MAKE_CMD "mingw32-make.exe")
+else()
+    set(MAKE_CMD "make")
+endif()
+
 ExternalProject_Add(
   Olm
 
   GIT_REPOSITORY https://git.matrix.org/git/olm.git
-  GIT_TAG 3f5b9dd6d72540a66da90b382a2eda088af63da0
+  GIT_TAG 4065c8e11a33ba41133a086ed3de4da94dcb6bae
 
   BUILD_IN_SOURCE 1
   SOURCE_DIR ${OLM_ROOT}
   CONFIGURE_COMMAND ""
-  BUILD_COMMAND make static
+  BUILD_COMMAND ${MAKE_CMD} static
   INSTALL_COMMAND ""
 )