Update README (A git remote helper for GPG-encrypted remotes)

README

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+
+    # git-remote-gcrypt
+    # Copyright 2013  by Ulrik
+    # License: GPLv2 or any later version, see http://www.gnu.org/licenses/
+    #
+    # Requires GnuPG
+    #
+    # We read git config gcrypt.recipients when creating new repositories
+
+Install as git-remote-gcrypt in $PATH
+
+Supports local, ssh:// and sftp:// remotes at the moment.
+
+    git config --global gcrypt.recipients KEYID1
+    git remote add gcryptrepo gcrypt::ssh://hostname.com:MyRepo.git
+
+WARNING: This is a proof of concept
+WARNING: Repository format WILL change, incompatibly