Add 'admins' config option to be used later on

Signed-off-by: pep <pep@bouah.net>

src/config.rs

@@ -25,6 +25,10 @@ use crate::error::Error;
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct Config {
+	/// Accounts trusted for admin tasks
+	#[serde(default = "Vec::new")]
+	pub admins: Vec<BareJid>,
+
 	/// Account address
 	pub jid: BareJid,