SVN will only manage files you tell it to handle. This is useful, as many projects tend to have temporary files in the repository folder, from temporary build files to personal notes. SVN will remind you of unmanaged files during commits, giving you a chance to add them to the repository before a final commit.
If you would rather SVN completely ignore a file or specific extension, follow this guide to do so.
Right-click the file or folder you want to put under version control. Click on Actions, Subversion (Kdesvn) and finally Add to Repository.
A dialog box will confirm the addition. Note that adding a folder will add all files inside it. You can remove some of the files from the change when committinglater on. Click OK to close the window.
It is highly recommended to commit your changes after adding or removing files, so other users of the repository can see the modified directory structure immediately.