Applets management (#568)

examples/change-mode.rs

@@ -0,0 +1,10 @@
+#![cfg(feature = "untested")]
+
+use yubikey::{mgm, YubiKey};
+
+fn main() {
+    let yubikey = YubiKey::open().unwrap();
+
+    let mut mgmt = mgm::Manager::new(yubikey).unwrap();
+    mgmt.enable_yubihsm().unwrap();
+}