Add simple appveyor msvc build

Signed-off-by: Fabrizio Fabbri <fabrizio.fabbri@gmail.com>

appveyor.yml

@@ -0,0 +1,31 @@
+os: Visual Studio 2015
+
+platform:
+- amd64
+- x86
+
+configuration:
+- Debug
+- Release
+
+# clone directory
+clone_folder: c:\build
+
+build_script:
+  - echo build_script
+  - cd c:\build\msvc
+  - if "%configuration%" == "Debug" set DEBUGFLAGS="ECL_DEBUG=1"
+  - if "%platform%" == "amd64" set PLATFORMFLAGS="ECL_WIN64=1"
+  - call "%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat" %platform%
+  - nmake /f Makefile %DEBUGFLAGS% %PLATFORMFLAGS%
+  - nmake /f Makefile install %DEBUGFLAGS% %PLATFORMFLAGS%
+
+#after_build:
+#  - cd c:\build\msvc
+#  - nmake /f Makefile windows-nsi
+
+#artifacts:
+#  - path: ecl.zip
+#    name: ECL
+
+deploy: off