Start a new release notes file (RELNOTES) in preparation for release

RELNOTES

@@ -1,43 +1,7 @@
-Etherboot 5.4.0
+gPXE 0.5.1
 
-PXE is now supported.  You will also need to configure your server to
-provide a pxelinux.0 loader file, kernel and initrd images, and a
-pxelinux.cfg directory with a appropriate configuration spec files.
+gPXE is an implementation of the PXE specification with extensions to
+allow additional features such as booting via HTTP, iSCSI, and AoE.
+In generally, it is compatible with the PXE specification, and also
+supports Etherboot .nbi file loading.
 
-See the PXELINUX home page at:
-
-    http://syslinux.zytor.com/pxe.php
-
-for more information. 
-
-There is no longer a default target for make.  You must specify an
-argument to make. Help text is now provided to indicate possible make
-targets.
-
-It should be possible to compile Etherboot with gcc >= 3.3.3, including
-gcc 3.4.x now that a couple of bugs have been tracked down. Please mail
-reports of success or failure to the etherboot-users list, together with
-the versions of gcc and binutils used.
-
-gcc 2.x is not supported anymore. You need at least gcc 3.x to compile
-etherboot due to C99 constructs.
-
-Removed etherboot(-pci)?.* rule because there are too many drivers and
-the image will no longer fit in memory. I don't want to choose a subset
-of drivers as everybody will have different preferences. So I'm going to
-piss off everybody equally by deleting the rule. Use the multiple driver
-rule (driver1--driver2--...) and select your own subset of drivers.
-
-In order to create .iso and .liso images you will need to have the
-packages mtools-3.9.9 or later, and syslinux-2.08 or later installed on
-your system.  These packages are available in various locations and
-formats.  .liso images are like .iso but use floppy emulation.  If you
-have a very old BIOS and .liso images don't work you may wish to try
-adding the -s option of syslinux as a last resort.
-
-EMERGENCYDISKBOOT has been renamed EXIT_IF_NO_OFFER, which describes it
-better.
-
-Menuing using DHCP options (mknbi/menu.c) has been removed.
-
-.exe format can be generated by doesn't work so not publicised.