added SetCountdownSettings Request (with buff)

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/qhybrid/requests/SetCountdownSettings.java

@@ -0,0 +1,26 @@
+package nodomain.freeyourgadget.gadgetbridge.service.devices.qhybrid.requests;
+
+import java.nio.ByteBuffer;
+
+public class SetCountdownSettings extends Request {
+    public SetCountdownSettings(int startTime, int endTime, short offset) {
+        ByteBuffer buffer = createBuffer();
+
+        buffer.putInt(startTime);
+        buffer.putInt(endTime);
+        buffer.putShort(offset);
+        // buff
+
+        this.data = buffer.array();
+    }
+
+    @Override
+    public byte[] getStartSequence() {
+        return new byte[]{2, 19, 1};
+    }
+
+    @Override
+    public int getPayloadLength() {
+        return 13;
+    }
+}