Move release notes into the repository

This way we can keep track of the release notes on a per-release
basis easier, by writing the notes directly as text files.

Change-Id: I0777120da45793ccb83aa5a580a59fbf99d06480
Signed-off-by: Shawn O. Pearce <sop@google.com>

ReleaseNotes/ReleaseNotes-2.0.23.txt

diff --git a/ReleaseNotes/ReleaseNotes-2.0.23.txt b/ReleaseNotes/ReleaseNotes-2.0.23.txt
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+Release notes for Gerrit 2.0.23
+===============================
+
+Gerrit 2.0.23 is now available in the usual location:
+
+link:http://code.google.com/p/gerrit/downloads/list[http://code.google.com/p/gerrit/downloads/list]
+
+Schema Change
+-------------
+
+There is no schema change in this release.
+
+
+New Features
+------------
+
+* Adding support to list merged and abandoned changes
++
+The project link in a change now lists all changes merged in that
+project, or abandoned in that project, based upon the state of the
+change the link is displayed in.  So open changes link to all open
+changes in the same project while merged changes link to all merged
+changes in the same project.  These links are bookmarkable.
+
+Bug Fixes
+---------
+
+* Fix new change email to always have SSH pull URL
+* Move git pull URL to bottom of email notifications
++
+The new change emails were missing the SSH pull URL, fixed.  Also
+the SSH pull URL is now further away from the web URL, to make it
+less likely one is clicked by accident in an email client.
+
+* issue 286    Fix Not Signed In errors when multiple tabs are open
++
+Users with multiple tabs open were getting session errors due to
+the tabs not agreeing about the session state.  Fixed.
+
+* Fix MySQL CREATE USER example in install documentation
+
+Other Changes
+-------------
+* Start 2.0.23 development
+* Move Jetty 6.x resources into a jetty6 directory
+* Move the Jetty 6.x start script to our extra directory
+* Add scripts for Jetty 7.x and make that the default i...
+* Merge change I574b992d
+* Gerrit 2.0.23
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