Initial version of Gerrit 2.6 release notes

Change-Id: Ibe8b4898da4c34dd52def444c1bcd6e382c3e165
diff --git a/ReleaseNotes/index.txt b/ReleaseNotes/index.txt
index 452057c..9d71f5f 100644
--- a/ReleaseNotes/index.txt
+++ b/ReleaseNotes/index.txt
@@ -1,6 +1,11 @@
 Gerrit Code Review - Release Notes
 ==================================
 
+[[2_6]]
+Version 2.6.x
+-------------
+* link:ReleaseNotes-2.6.html[2.6]
+
 [[2_5]]
 Version 2.5.x
 -------------