docs: n34 book

Signed-off-by: Awiteb <a@4rs.nl>

docs/sets/new.md

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+# Create a Set
+
+> `n34 sets new` command
+
+**Usage:**
+```
+Create a new set
+
+Usage: n34 sets new [OPTIONS] <NAME>
+
+Arguments:
+  <NAME>  Unique name for the set
+
+Options:
+      --set-relay <RELAYS>         Optional relay to add it to the set, either as URL or set name to extract its relays. [aliases: `--sr`]
+      --repo <NADDR-NIP05-OR-SET>  Repository address in `naddr` format (`naddr1...`), NIP-05 format (`4rs.nl/n34` or `_@4rs.nl/n34`), or a set name like `kernel`
+```
+
+Each set requires a unique name, provided as the final argument to the command.
+Use the `--set-relays`/`--sr` option to specify the relays for the new set;
+this can be a relay URL or the name of an existing set whose relays you wish to
+use. To add repositories, use the `--repo` option. Check [passing repositories]
+format.
+
+[passing repositories]: /commands.html#passing-repositories