You've been put into the editor to write your commit message.
The commit message describes what your commit does. For a commit like this I'd probably do something like "initial import"
You can provide the commit on the command line with -m "initial import"
or by putting your message in a file and reference the file e.g. -F svn.commit.tmp
This is covered in this section of the svnbook: http://svnbook.red-bean.com/en/1.7/svn.tour.cycle.html#svn.tour.cycle.commit