Migrate everything on Gradle

Also added tasks to run the server & client separately

ChatApp/app/src/main/java/network/SocketWriter.java

@@ -0,0 +1,30 @@
+package network;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetSocketAddress;
+
+import network.protocol.Packet;
+
+public class SocketWriter {
+
+	private final DatagramSocket socket;
+
+	public SocketWriter(DatagramSocket socket) {
+		this.socket = socket;
+	}
+
+	public void sendPacket(Packet packet, InetSocketAddress address) throws IOException {
+		ByteArrayOutputStream stream = new ByteArrayOutputStream();
+		ObjectOutputStream oos = new ObjectOutputStream(stream);
+		oos.writeObject(packet);
+		oos.flush();
+		byte[] data = stream.toByteArray();
+		DatagramPacket dataPacket = new DatagramPacket(data, data.length, address.getAddress(),
+				address.getPort());
+		this.socket.send(dataPacket);
+	}
+}