docs/markdown: add snippet for intel-cl support

docs/markdown/snippets/intel-cl.md

@@ -0,0 +1,13 @@
+## Support for the Intel Compiler on Windows (ICL)
+
+Support has been added for ICL.EXE and ifort on windows. The support should be
+on part with ICC support on Linux/MacOS. The ICL C/C++ compiler behaves like
+Microsoft's CL.EXE rather than GCC/Clang like ICC does, and has a different id,
+`intel-cl` to differentiate it.
+
+```meson
+cc = meson.get_compiler('c')
+if cc.get_id == 'intel-cl'
+  add_project_argument('/Qfoobar:yes', language : 'c')
+endif
+```