Additional deploy instructions

Author: motdotla

README.md

@@ -256,7 +256,14 @@ Let's begin with the permissions.
 cp gradle.properties.example ~/.gradle/gradle.properties
 ```
 
-Edit that file and set your `sonatypeUsername` and sonatypePassword`.
+Edit that file and set your `sonatypeUsername` and sonatypePassword`. You also need to set the values for your keys. Here's how to list/create them. [1](http://central.sonatype.org/pages/working-with-pgp-signatures.html).
+
+```
+gpg2 --list-keys
+gpg --gen-key
+```
+
+Then set the values for `signing.keyId` and `signing.secretKeyRingFile`. You don't need to set the `signing.password`.
 
 Cool, now you can do the following.