r/gpg.md: add notes on gpg key generation

r/gpg.md

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+
+Quick GPG note where I may find it.
+
+To create an Ed25519 key, or whatever will be the default version in the
+future as defined by your GPG version:
+
+```
+gpg --quick-gen-key address@domain.example future-default
+```
+
+Note the keyid and edit it
+
+```
+gpg --edit-key KEYID
+adduid # here fill your name and details as asked
+1 # to select the uid the first command generated
+deluid # to delete the uid which doesn't contain your name
+save
+```
+
+Then you are ready to publish the public key however you generally publish
+it, preferably in multiple places from where some recognise revokation
+certificates if the time ever comes.
+
+NOTE: You can extend the expiry time of an expired gpg signature by issuing
+the `expire` command in `--edit-key` and the key is valid again when the
+update is reimported to gpg keyrings by other people.
+
+Keybase note: To publish the key `keybase pgp select --multi` (where multi
+is required for multiple PGP keys per account` and to submit changes to it,
+`keybase pgp update --all` (where --all is again necessary only if you have
+multiple keys).