I moved svn folder to another location and was trying to add it under svn at new location. It gave me error and I found a solution that I should delete all hidden folders named ".svn". Then I started to find the hidden folders but could not find them and could not find any way make then visible using settings. I found the solution that if we execute below command on terminal then it will make hidden folders/files visible.
defaults write com.apple.finder AppleShowAllFiles TRUE