add PingPacket

src/main/java/mc/protocol/status/PingPacket.java

@@ -0,0 +1,22 @@
+package mc.protocol.status;
+
+import lombok.Data;
+import mc.protocol.Packet;
+import mc.protocol.io.NetInputStream;
+import mc.protocol.io.NetOutputStream;
+
+@Data
+public class PingPacket implements Packet {
+
+    private Long payload;
+
+    @Override
+    public void readSelf(NetInputStream netInputStream) {
+        payload = netInputStream.readLong();
+    }
+
+    @Override
+    public void writeSelf(NetOutputStream netOutputStream) {
+        netOutputStream.writeLong(payload);
+    }
+}