Doc: NR - Input.itely instructions for Gonville

Added how tos for Windows and MacOs
Had to comment out first few lines until sizing issue of added png files in PDF can be resolved

diff --git a/Documentation/notation/input.itely b/Documentation/notation/input.itely
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+++ b/Documentation/notation/input.itely
@@ -1435,7 +1435,43 @@ lilypond}.
 @node Replacing the notation font
 @subsection Replacing the notation font
 
-FIXME stub.
+Gonville is an alternative to the Feta font used in LilyPond and can
+be downloaded from:
+@example
+@uref{http://www.chiark.greenend.org.uk/~sgtatham/gonville/ ,http://www.chiark.greenend.org.uk/~sgtatham/gonville/}
+@end example
+
+Here are a few sample bars of music set in Gonville:
+
+@sourceimage{Gonville_after,,,}
+
+Here are a few sample bars of music set in LilyPond's Feta font:
+
+@sourceimage{Gonville_before,,,}
+
+@subsubheading Installation Instructions for MacOS
+
+Download and extract the zip file.  Using @code{Terminal.app}, move
+the @code{lilyfonts} directory to
+@file{@var{INSTALLDIR}/LilyPond.app/Contents/Resources/share/lilypond/current}.
+Move the existing @code{fonts} directory to @code{fonts_orig} and
+move the @code{lilyfonts} directory to @code{fonts}.  Simply move
+@code{fonts_orig} back to @code{fonts} to revert back to Feta.
+
+@subsubheading Installation Instructions for Windows
+
+Download and extract the zip file.  Using Explorer, copy the @code{lilyfonts}
+directory to
+@file{@var{INSTALLDIR}/LilyPond/usr/share/lilypond/current}. Rename
+the existing @code{fonts} directory to @code{fonts_orig} and
+rename the @code{lilyfonts} directory to @code{fonts}.  Simply rename
+@code{fonts_orig} back to @code{fonts} to revert back to Feta.
+
+@knownissues
+
+Gonville cannot be used to typeset @q{Ancient Music} notation.  Please
+refer to the author's website for more information on this and other
+specifics including licensing of Gonville.
 
 
 @node MIDI output

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