In trunk, we have support for generating git diffs (with 'svn diff --git'), and I believe the plan is to eventually support applying such diffs too (via 'svn patch'). If you'd like to help with the 'svn patch' work, please drop by the dev@ list and say hi. :-)
If you'd like to add something to contrib/, then submit that to the dev@ list; but we've deprecated that folder a while ago, and I believe we won't accept new entries. That just means you'll have to host the script elsewhere. Armands Valdmanis wrote on Fri, Oct 22, 2010 at 14:40:04 +0300: > Hi, > > I would like to contribute a script for contrib/client-side. > It takes 'git diff' generated diff (with file copying and renaming) > and applies to working copy of SVN. > Where do I submit it? > > Regards, > Armands