Add Directory to SVN - and Permssion - Please clarify

Hi

I want to add some directories to a SVN tree and give permission to
individual users. Please help me to do it.

Example: I want to create directories A, B , C , D, E to a SVN Tree and the
Directory A can be only accessed by User1, B by User2, C by User 3, D by
User4, E by User 5.

Thanks in advance for the support

-- 
Regards
Santhosh Kumar K V