Update README

README.md

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-# git-identity-manager
-Manage different git identities on your computer.  Good for modifying user, name, and private key for Git.
+# Git Identity Manager
+
+Ever find that managing multiple git identities is a pain?  This git transport
+attempts to make it less painful.
+
+![Knowing who you are can be painful][backpain]
+
+[Image credit PBS.org][pbs]
+
+# Installation
+
+Add `git-idm` script to your `$PATH` and make it executable.  Then, you can
+access the script via `git idm`.  See `git idm help` for usage.
+
+# Uninstall
+
+    git idm uninstall
+
+# Quick start
+
+Add your first identity.
+    git idm add jcool --name "Joe Cool" --email [email protected] --key ~/.ssh/id_rsa
+
+Activate your identity.
+
+    git idm use jcool
+
+Show which identity is active.
+
+    git idm active
+
+List all known identities.
+
+    git idm list
+
+For more commands see `git help idm`.
+
+# License
+
+[MIT License](LICENSE.txt)
+
+[backpain]: https://user-images.githubusercontent.com/875669/40868569-f1512a4e-65c2-11e8-9dfe-91ece96d62db.jpg
+[pbs]: https://www.pbs.org/newshour/health/back-pain-industry-taking-patients-unhealthy-ride