This assumes you have Subversion installed on your local PC. These examples are based on Linux.

Let's say you have checked out http://example.com/svn/repo/testing from the master Subversion repository to /tmp/SVN on your local PC. Create a new file in the directory.

cd /tmp/SVN
touch foo.txt

Add the new file to Subversion.

svn add foo.txt

The svn status command will now show that foo.txt has a status of A (ready to be committed).

svn status foo.txt
A         SVN/foo.txt

You would then commit the new file.