README: Add note about GPG keys to configuration section

To use the ipc module, users need to have a usable gpg keypair, but
the README does not mention that.

This commit adds a paragraph about GPG to the configuration section
of the README.

diff --git a/README.md b/README.md
index 955dd8fb88d54bdcca7987e3311aca5b4b465bd7..500ca24a01f41476e1c6d3b8e33975d766cc2ad5 100644 (file)
--- a/README.md
+++ b/README.md
@@ -123,6 +123,11 @@ You can add a user to these groups with the following command.
 
     # usermod -a -G toolbox,toolbox_ipc USERNAME
 
+The ipc module uses GPG to sign and verify messages, so you also need to make
+sure that you have a keypair. You can generate one with the following command.
+
+    $ gpg --full-generate-key
+
 
 ## How does this work?