- Checkout a working copy of the repository (or at least the subdirectory that you want to add the files to):
svn checkout https://example.org/path/to/repo/bleh - Copy the files over there.
svn add file1 file2...svn commit
I am not aware of a quicker option.
Note: if you are on the same machine as your Subversion repository, the URL can use the file: specifier with a path in place of https: in the svn checkout command. For example svn checkout file:///path/to/repo/bleh.
PS. as pointed out in the comments and other answers, you can use something like svn import . <URL> if you want to recursively import everything in the current directory. With this option, however, you can’t skip over some of the files; it’s all or nothing.