Add a few endpoints

- Added Hermes.startListening()
- Added MPD.pause()

shingle/src/net/okennedy/shingle/component/Hermes.scala

@@ -38,4 +38,13 @@ object Hermes extends Component
         "siteId" -> siteId
       )
   }
+
+  def startListening(siteId: String = defaultSiteId): Unit =
+  {
+    Mqtt("hermes/hotword/default/detected") << ujson.Obj(
+      "wakewordId" -> "default",
+      "modelId" -> "default",
+      "siteId" -> siteId
+    )
+  }
 }

shingle/src/net/okennedy/shingle/component/MPD.scala

@@ -76,6 +76,9 @@ object MPD
   def play(): Unit =
     instance.getPlayer.play()
 
+  def pause(): Unit =
+    instance.getPlayer.pause()
+
   def clear(): Unit =
     instance.getPlaylist.clearPlaylist()