Add FrenchHornDemo to test sound on the conference

(cherry picked from commit 1adcaf4)

tea-service/src/main/java/org/example/teahouse/tea/FrenchHornDemo.java

@@ -0,0 +1,26 @@
+package org.example.teahouse.tea;
+
+import javax.sound.midi.MidiChannel;
+import javax.sound.midi.MidiSystem;
+import javax.sound.midi.MidiUnavailableException;
+import javax.sound.midi.Synthesizer;
+
+public class FrenchHornDemo {
+    public static void main(String[] args) throws MidiUnavailableException, InterruptedException {
+        Synthesizer synthesizer = MidiSystem.getSynthesizer();
+        synthesizer.open();
+        MidiChannel channel = synthesizer.getChannels()[0];
+        // French Horn is bank #0 preset #60
+        channel.programChange(synthesizer.getAvailableInstruments()[60].getPatch().getProgram());
+
+        // C4 (middle C)
+        int note = 60;
+        try {
+            channel.noteOn(note, 90);
+            Thread.sleep(1_000);
+        }
+        finally {
+            channel.noteOff(note);
+        }
+    }
+}