Add a NEWS file with major changes starting from the 4.2 release

NEWS

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+xen-tools 4.3 (released [TODO])
+================================
+
+New Options
+-----------
+
+    --dontformat (xen-create-image)
+    --finalrole  (xen-create-image)
+    --apt_proxy  (xen-create-image)
+
+Newly Supported Distribution Releases
+-------------------------------------
+
+* Ubuntu 11.10 Oneiric
+* Ubuntu 12.04 Precise
+* Ubuntu 12.10 Quantal DomUs
+
+
+xen-tools 4.2.1 (released 17 Mar 2011)
+======================================
+
+Bugfix Release only
+
+
+xen-tools 4.2 (released 05 Oct 2010)
+====================================
+
+First final release of the new Xen-Tools Team.
+
+Supports Ubuntu up to 11.04 (Natty) and Debian up to 7.0 (Wheezy).
+
+
+New Options
+-----------
+
+    --debootstrap-cmd (xen-create-image and xt-install-image)
+
+New Features and Major Changes
+------------------------------
+
+* Uses hvc0 and xvda devices by default
+* Also supports cdebootstrap
+* Preliminary btrfs support.
+* Uses GeoIP for Debian mirrors: Default Debian mirror is now
+  cdn.debian.net, see http://wiki.debian.org/DebianGeoMirror for
+  details.
+* New helper program xt-guess-suite-and-mirror, used to find the
+  default mirror and suite.