Because svn add command does not support recursive addition of unversioned files you can use this little script to do it.
Create new file in /usr/local/bin with name svnadd with following content
#!/bin/sh svn status | perl -ne 's/^\?\s+(\S.+)$/\1/g;chomp;system("svn add \"$_\"");'
Save it. From now on you can execute svnadd command in your working directory.