Add service announcement channel

src/main/kotlin/de/wulkanat/DiscordRpc.kt

@@ -0,0 +1,15 @@
+package de.wulkanat
+
+import net.dv8tion.jda.api.JDA
+import net.dv8tion.jda.api.entities.Activity
+
+object DiscordRpc {
+    var jda: JDA? = null
+
+    fun updatePresence(available: Boolean) {
+        jda ?: return
+
+        jda!!.presence.activity = Activity.watching(if (available) Admin.message else Admin.offlineMessage)
+        jda!!.presence.isIdle = !available
+    }
+}