Readme and UI update

Make the UI more beautiful.

Author: AuroraRAS

README.md

@@ -11,4 +11,9 @@ Androtator helps you keep your antenna pointing to the satellite. It run on Andr
  `./build_hamlib.sh`
 
 3. Build Androtaor using your Qt Creator.
-4. Open an issue tell me, if you get any errors.
+4. Open an issue tell me, if you get any errors.
+
+## Screenshots
+![Screenshot](./docs/Screenshot03.png)
+![Screenshot](./docs/Screenshot01.png)
+![Screenshot](./docs/Screenshot02.png)

docs/Screenshot01.png

@@ -31,6 +31,7 @@ PolarWidget::PolarWidget(QWidget *parent) : QChartView(parent)
     circle->attachAxis(angularAxis);
 
     chart->legend()->hide();
+    chart->setBackgroundBrush(QBrush(QColor("transparent")));
     this->setChart(chart);
     this->setRenderHint(QPainter::Antialiasing);
 }