Documentation for cygwin-console-helper.exe

[cyg Simple]

The documentation for cygwin-console-helper.exe is missing, not even a
--help function.  No comments in the source code.  Only a code.google
page for mintty[1] was beneficial to allow me to understand it and then
it was a late entry comment that sort of explained the purpose.  I will
revisit this issue with a source code patch to add comments.

[1]https://code.google.com/archive/p/mintty/issues/39

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