Added HACKING instructions - please revise as necessary

HACKING

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+If you want to hack on the Gtk+ project, it will make you life easier
+to have the following packages installed:
+
+	- GNU autoconf 2.12
+	- GNU automake 1.2d
+		Available in ftp://ftp.cygnus.com/pub/tromey
+	- GNU libtool 1.0h
+		Available in ftp://alpha.gnu.org/gnu/
+
+These should be available by ftp from prep.ai.mit.edu or any of the
+fine GNU mirrors.  Beta software can be found at alpha.gnu.org.
+
+If you are accessing gtk+ via CVS, then you will need to take several
+steps to get it to compile.  These are:
+
+	cvsroot/gtk+# aclocal; automake; autoconf
+
+The "configure" script will not exist until you take these steps.
+
+Before running configure, make sure you have libtool in your path
+
+Please submit patches to the gtk-list@redhat.com mailing list (you must
+subscribe before you post, e-mail gtk-list-request@redhat.com with a
+subject of "subscribe"). All kinds of contributions are accepted. If at
+all possible, please use CVS to get the latest development version of
+gtk+; the README file has the CVSROOT information. 
+