Added minimal UDP client and server examples

tmp/udp/udp_server/udpserver.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <QObject>
+#include <QUdpSocket>
+#include <QJsonDocument>
+
+class UdpServer : public QObject
+{
+    Q_OBJECT
+public:
+    explicit UdpServer(int portNumber, QObject *parent = nullptr);
+
+private slots:
+    void readPendingDatagrams();
+
+private:
+    QUdpSocket *mUdpSocket;
+
+signals:
+    void newJsonDocument(QJsonDocument);
+};