add PingPacket

src/main/java/mc/protocol/State.java

@@ -5,6 +5,7 @@ import com.google.common.collect.ImmutableBiMap;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 import mc.protocol.handshake.client.HandshakePacket;
+import mc.protocol.status.PingPacket;
 import mc.protocol.status.client.StatusServerRequest;
 import mc.protocol.status.server.StatusServerResponse;
 
@@ -21,11 +22,13 @@ public enum State {
     STATUS(1,
             // server bound
             ImmutableBiMap.of(
-                    0x00, StatusServerRequest.class
+                    0x00, StatusServerRequest.class,
+                    0x01, PingPacket.class
             ),
             // client bound
             ImmutableBiMap.of(
-                    0x00, StatusServerResponse.class
+                    0x00, StatusServerResponse.class,
+                    0x01, PingPacket.class
             )
     ),
     LOGIN(2);

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);
+    }
+}