The symfony.php file should have been in root of the SVN checkout you made. However I can't find it in svn myself, so just create a new project with the symfony command, and the resulting project should have this file. Copy that file to the root of your askeet project.
If you are stuck then use the attached file, which is the auto-generated one from my project (I think 1.0.16, presumably it didn't change at all across 1.0.x versions). Bear in mind you shouldn't usually trust files like this for obvious reasons, but hopefully my post count vouches for me.
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