first draft of 10.9 release notes

[Rick Hillegas]

I have checked in the first rev of the 10.9 release notes: 
http://svn.apache.org/viewvc/db/derby/code/trunk/RELEASE-NOTES.html?view=co

We still need a detailed release note for DERBY-1016.
Please let me know how I can improve these notes.

Thanks,
-Rick