Add install rule for Doxygen generated docs

ChangeLog.md

@@ -12,6 +12,7 @@ The format is based upon [Keep a Changelog].
 - Internationalization for the following:
     * libx52
     * x52test
+- Doxygen generation of HTML documentation for libx52 methods.
 
 ### Changed
 - libx52_init no longer fails when a supported joystick is not connected.

Makefile.am

@@ -38,4 +38,7 @@ CLEANFILES = docs
 all-local: docs/.stamp
 clean-local:
 	rm -rf $(top_builddir)/docs
+install-data-local:
+	$(INSTALL) -d $(DESTDIR)$(docdir)
+	rsync -a $(top_builddir)/docs/html $(DESTDIR)$(docdir)
 endif

README.md

@@ -39,6 +39,12 @@ You will need the following packages:
 
 If you are on OSX, you can install the above packages using Homebrew
 
+If you want to generate HTML documentation for the library, you will need the
+following packages:
+
+* doxygen
+* rsync
+
 ## Installation
 
 1. Clone the repository