Added README for the XenSource-hosted initrd.

Signed-off-by: Ewan Mellor <ewan@xensource.com>

diff --git a/tools/xm-test/ramdisk/README-XenSource-initrd-0.7-img b/tools/xm-test/ramdisk/README-XenSource-initrd-0.7-img
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+XenSource xm-test 0.7 initrd.img
+================================
+
+initrd-0.7.img is an initrd suitable for use with Xen's xm-test regression
+testing suite.  It has been built and provided by XenSource, for the
+convenience of Xen users.  xm-test initrds may be mixed across minor xm-test
+versions, but not across major versions; this initrd is suitable for all 0.7.x
+versions of xm-test (as shipped with Xen 3.0.x).
+
+In order to use this initrd, run "./autogen; ./configure; make existing"
+inside the xm-test directory, and the initrd will be downloaded automatically.
+Alternatively, if you have already downloaded this file, place it into the
+xm-test/ramdisk directory and run the same command.  In either case,
+runtest.sh can then be used as normal.  See xm-test/README for more details.
+
+This initrd was built using the infrastructure provided by xm-test.  It is a
+full guest operating system and filesystem, and as such includes a large
+number of pieces of software.  The source code for the majority of these are
+included in full inside the file
+http://xm-test.xensource.com/ramdisks/initrd.0.7.img-buildroot.tar.bz2, or
+alongside this file.  Copyright statements and licences are contained therein.
+The remaining source code is included in the Xen distribution, at
+http://www.xensource.com/xen/downloads/archives.html.  The configuration used
+for BusyBox is available as
+http://xm-test.xensource.com/ramdisks/initrd-0.7-busybox-config, or alongside
+this file.
+
+XenSource and the Xen contributors are grateful to the authors of these
+software packages for their contributions to free and open-source software.
+
+
+Buildroot and BusyBox are Copyright (c) Erik Andersen <andersen@codepoet.org>.
+BusyBox is licensed under the GNU General Public License (GPL).  A copy of
+this license is available in the file GPL-2,
+http://xm-test.xensource.com/ramdisks/GPL-2, or alongside this file.
+
+uClibc is licensed under the GNU Lesser General Public License (LGPL).  A copy
+of this license is available in the file
+http://xm-test.xensource.com/ramdisks/LGPL-2, or alongside this file.