git-svn: add page

pages/common/git-svn.md

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+# git svn
+
+> Bidirectional operation between a Subversion repository and Git
+
+- clone an SVN repository
+
+`git svn clone {{http://example.com/my_subversion_repo}} {{local_dir}}`
+
+- update local clone from the upstream SVN repository
+
+`git svn rebase`
+
+- commit back to SVN repository
+
+`git svn dcommit`