Added task info #13 (#17)

src/routes/tasks.ts

@@ -18,7 +18,7 @@ async function addTask(req, res) {
   } else if(from >= to) {
     res.status(500).send('Range error: "from" should be less than "to"');
   } else {
-    res.status(200).send('Task added');
+    res.status(200).send('Exporting ' + datasourceName + ' data from ' + new Date(from).toLocaleString() + ' to ' + new Date(to).toLocaleString());
     let target = new Target(panelUrl, user, datasource, targets, from, to, datasourceName);
     target.export();
   }