Merge pull request #356 from sbriseid/sisl_vs2022_support

Updated sisl ref, added some sisl related info about glut on Windows.

INSTALL

@@ -129,13 +129,21 @@ PugiXML & JsonCpp:
   change to msvc2015 for Visual Studio 2015).
 
 OpenGL:
-- If cmake does not find the gl.h and glu.h files they may be placed in the '~/Install/include/GL'
-  folder.
+- If cmake does not find the gl.h and glu.h files they may be copied to the '~/Install/include/GL'
+  folder. If you are using Visual Studio and selected the C++ workload option in the installer then
+  the files should be located in a subfolder of "C:/Program Files (x86)/Windows Kits".
 - For computers without working OpenGL drivers (typically the case for virtual machines) MESA may be
   used (software rendering). In the folder with the application there is a library named
   'opengl32sw.dll'. This library should be copied and renamed to 'opengl32.dll', which will then be
   used by the application.
 
+FreeGLUT:
+- Compilation of the sisl viewer requires freeglut. Compilation of the app is off by default.
+- Freeglut may be downloaded and built using Visual Studio:
+  https://github.com/FreeGLUTProject/freeglut
+- The include and library files should be placed in locations in the same manner as for PugiXML &
+  JsonCpp.
+
 CMake:
 - In order to run the testst you should add $CMAKE_DIR/bin to the PATH, allowing ctest.exe to be
   found.