NEW: Better Readme.

README.md

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-# identitychooser-mx
-A thunderbird mailextension for explicitely choosing the right sender identity before opening an email editor.
+# Identity Chooser MX for Mozilla Thunderbird
+
+Do you remember the first time you accidentally sent a work related
+email from your private email account? Identity Chooser helps you to
+prevent that. It makes choosing the sender address explicit:
+
+* Do you want to compose a new email? Identity Chooser forces you to
+  choose the sender address first.
+
+* Do you want to forward an email? Identity Chooser forces you to
+  choose the sender address first.
+
+To make it short: Every time you'll create a new message, Identity
+Chooser shows you a menu with all your identities.
+
+Everything in Identity Chooser is about making explicit choices. No
+automatisms, no defaults.
+
+And as a result you'll never send an email from the wrong email
+address again.
+
+## How to install
+
+Head over to [addons.thunderbird.net][ic-mx] to find the current
+version.  Development releases might be available earlier in the
+[Releases] section on GitHub.
+
+  [ic-mx]: https://addons.thunderbird.net/addon/identity-chooser/
+  [releases]: https://github.com/speedball2001/identitychooser-mx/releases