Emit a description in filetransferjob

This basically allows Plasma (or any other job trakcer) to show
a nice description showing FROM and TO, kinda:

From: Nexus5
To: ~/afiestas/Downloads/foo.mkv

kded/filetransferjob.cpp

@@ -37,6 +37,7 @@ FileTransferJob::FileTransferJob(const QSharedPointer<QIODevice>& origin, int si
     mOrigin = origin;
     mSize = size;
     mWritten = 0;
+    mDeviceName = i18nc("Device name that will appear on the jobs", "KDE-Connect");
     kDebug(kdeconnect_kded()) << "FileTransferJob Downloading payload to" << destination;
 }
 
@@ -49,6 +50,10 @@ void FileTransferJob::start()
 {
     //kDebug(kdeconnect_kded()) << "FileTransferJob start";
 
+    description(this, i18n("Receiving file over KDE-Connect"),
+                        QPair<QString, QString>(i18nc("File transfer origin", "From"),
+                        QString(mDeviceName)),
+                        QPair<QString, QString>(i18nc("File transfer destination", "To"), mDestination->url().path()));
     //Open destination file
     mDestination->start();
 }

kded/filetransferjob.h

@@ -40,6 +40,7 @@ public:
     virtual void start();
     KUrl destination() { return mDestination->url(); }
 
+    void setDeviceName(const QString &deviceName) {mDeviceName = deviceName;};
 public Q_SLOTS:
     void readyRead();
     void open(KIO::Job*);
@@ -49,6 +50,7 @@ public Q_SLOTS:
 private:
     QSharedPointer<QIODevice> mOrigin;
     KIO::FileJob* mDestination;
+    QString mDeviceName;
     int mSize;
     int mWritten;