add vs2019 script

scripts/devenv-vs2019.bat

+@echo off
+:: command line for MSVC build (Visual Studio 2019)
+
+set PATH=%PATH%;%MYLOCAL%\swig
+set INCLUDE=%MYLOCAL%\include;%MYLOCAL%\MUMPS\include;%MYLOCAL%\eigen
+set LIB=%MYLOCAL%\MUMPS\lib
+
+call "C:\Program Files (x86)\IntelSWTools\compilers_and_libraries\windows\mkl\bin\mklvars.bat" intel64 vs2019
+call "C:\Program Files (x86)\IntelSWTools\compilers_and_libraries\windows\tbb\bin\tbbvars.bat" intel64 vs2019
+%comspec% /K ""C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvars64.bat" amd64"