Add icon

AdaptiveBrightness/AdaptiveBrightness.qrc

@@ -1,4 +1,5 @@
 <RCC>
-    <qresource prefix="AdaptiveBrightness">
+    <qresource prefix="/AdaptiveBrightness">
+        <file>resources/brightness_system.ico</file>
     </qresource>
 </RCC>

AdaptiveBrightness/AdaptiveBrightness.ui

@@ -13,6 +13,10 @@
   <property name="windowTitle">
    <string>AdaptiveBrightness</string>
   </property>
+  <property name="windowIcon">
+   <iconset resource="AdaptiveBrightness.qrc">
+    <normaloff>:/AdaptiveBrightness/resources/brightness_system.ico</normaloff>:/AdaptiveBrightness/resources/brightness_system.ico</iconset>
+  </property>
   <widget class="QWidget" name="centralWidget"/>
   <widget class="QMenuBar" name="menuBar">
    <property name="geometry">