Added an example for PyQt5 (#389)

* added pyqt5 example

* fixed example path on build

* improved pyqt example

* simplified example

examples/cpp/RemoteTerm/main.cpp

@@ -0,0 +1,19 @@
+#include "remoteterm.h"
+#include <QApplication>
+#include <QDebug>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    if(a.arguments().size() != 3){
+        qDebug() << "Example(client-side) for remote terminal of QTermWidget.";
+        qDebug() << QString("Usage: %1 ipaddr port").arg(a.arguments()[0]);
+        return 1;
+    }
+    QString ipaddr = a.arguments().at(1);
+    quint16 port = a.arguments().at(2).toUShort();
+    RemoteTerm w(ipaddr,port);
+    w.show();
+
+    return a.exec();
+}