add README.md

Author: tarsius

README.md

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+# StGit extension for Magit
+
+This package provides very basic support for StGit.
+
+StGit (Stacked Git) is an application that aims to provide a
+convenient way to maintain a patch stack on top of a Git branch.
+For more information about StGit see http://www.procode.org/stgit.
+
+When `magit-stgit-mode` is turned on then the current patch series
+is displayed in the status buffer.  While point is on a patch the
+changes it introduces can be shown using `RET`, it can be selected
+as the current patch using `a`, and it can be discarded using `k`.
+Other StGit commands are available from the StGit popup on `/`.
+
+To enable the mode in a particular repository use:
+
+    cd /path/to/repository
+    git config --add magit.extension stgit
+
+To enable the mode for all repositories use:
+
+    git config --global --add magit.extension stgit
+
+To enable the mode globally without dropping to a shell:
+
+    (add-hook 'magit-mode-hook 'magit-stgit-mode)
+
+If you are looking for full fledged StGit support in Emacs, then
+have a look at `stgit.el` which is distributed with StGit.