First draft of modern explanatory README

(cherry picked from commit 4f7338bbfc)

README.md

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+# ssh
+
+The `ssh` library is a fork of, and spiritual successor to, the
+[Paramiko](http://www.lag.net/paramiko/) Python SSH library. It was created by
+the developers of the [Fabric](http://fabfile.org) library as a way to ensure
+timely updates and bugfixes for critical issues.
+
+`ssh` is currently in a transitional state and other than a rename and a
+handful of small but crucial source changes, the code and the documentation
+remain unchanged from the original.
+
+We hope to clean up the presentation and documentation in the near future, as
+more bugfixes and API additions are rolled out. We also plan to absorb some of
+the higher profile bugs/issues from the Paramiko Github repository as well.
+
+Thank you for your patience!