Merge branch 'master' of https://github.com/0x1mason/GribApi.XP

Author: 0x1mason

README.md

@@ -19,3 +19,8 @@ C:\> choco install grib-tools
 
 ##### Building
 You can build directly with Visual Studio using `./build/Grib.Api.Master.sln`.
+
+To build x86 and x64 libs together, you can run `build\build_gribapi.cmd [re|build] [vs tools version] [Debug|Release] [opt: package version]`, e.g.
+```shell
+C:\> build\build_gribapi.cmd rebuild 12 Debug
+```