Added missing hyphen to usage
Added scaffolding to support adding stuff to keyrings.
Added example decrypt note
Fleshed out the possibility to make keyrings.
Added my public key as an example key.
Renamed gpg-keys to pgp-keys

--HG--
rename : examples/simple-declaration/users/johndoe@example.com/gpg-keys/E73D38BA.asc => examples/simple-declaration/users/johndoe@example.com/pgp-keys/E73D38BA.asc
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