Create INSTALL

INSTALL

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+# Installation
+
+Tested on Windows 2010 with VS 2019 Express, 
+sources used : [Boost 1.7](boost_1_74_0.7z), Coin3D ans SoWin from git (check INSTALL)
+
+
+## install Coin3D
+
+cmake -Hcoin -Bcoin_build -G "Visual Studio 16 2019" -DCMAKE_INSTALL_PREFIX=T:\Projects\Coin -DBOOST_ROOT=G:\Projects\Libs\boost_1_74_0 -DCOIN_BUILD_DOCUMENTATION=OFF
+
+cmake --build coin_build --target ALL_BUILD --config Release -- /nologo /verbosity:minimal /maxcpucount
+cmake --build coin_build --target INSTALL --config Release -- /nologo /verbosity:minimal /maxcpucount
+
+
+## install SoWin
+
+cmake -Hsowin -Bsowin_build -G "Visual Studio 16 2019" -DCMAKE_INSTALL_PREFIX=T:\Projects\Coin -DBOOST_ROOT=G:\Projects\Libs\boost_1_74_0 -DCOIN_BUILD_DOCUMENTATION=OFF -DCMAKE_PREFIX_PATH=T:/Projects/Coin/lib/cmake/Coin-4.0.1/
+
+cmake --build sowin_build --target ALL_BUILD --config Release -- /nologo /verbosity:minimal /maxcpucount
+cmake --build sowin_build --target INSTALL --config Release -- /nologo /verbosity:minimal /maxcpucount