add a documentation for QSystemTrayIcon (#141)

website/docs/api/QSystemTrayIcon.md

@@ -0,0 +1,59 @@
+---
+sidebar_label: QSsystemTrayIcon
+title: QSsystemTrayIcon
+---
+
+> Create and control system tray icon.
+
+**This class is a JS wrapper around Qt's [QSystemTrayIcon class](https://doc.qt.io/qt-5/qsystemtrayicon.html)**
+
+A `QSystemTrayIcon` provides ability to add and manipulate native system tray icon.
+
+**QSystemTrayIcon inherits from [EventWidget](api/EventWidget.md)**
+
+### Example
+
+```javascript
+const { QSystemTrayIcon, QIcon } = require("@nodegui/nodegui");
+const trayIcon = new QIcon(
+  resolve(__dirname, "some/image/file.png");
+);
+const tray = new QSystemTrayIcon();
+tray.show();
+
+global.trayIcon = trayIcon; // prevent's gc of trayIcon
+```
+
+### `new QSystemTrayIcon(parent?)`
+
+- `parent` NodeWidget (_optional_). Any widget inheriting from NodeWidget can be passed as a parent. This will make this widget, the child of the parent widget.
+
+## Static Methods
+
+QSystemTrayIcon can access all the static methods defined in [EventWidget](api/EventWidget.md)
+
+## Instance Properties
+
+QSystemTrayIcon can access all the instance properties defined in [EventWidget](api/EventWidget.md)
+
+## Instance Methods
+
+QSystemTrayIcon can access all the instance methods defined in [EventWidget](api/EventWidget.md). Additionally it also has the following instance methods:
+
+### `trayIcon.show()`
+
+Shows the icon in the system tray icon. It calls the native method [QSystemTrayIcon: show](https://doc.qt.io/qt-5/QSystemTrayIcon.html#show).
+
+### `trayIcon.hide()`
+
+Hides the system tray icon. It calls the native method [QSystemTrayIcon: hide](https://doc.qt.io/qt-5/QSystemTrayIcon.html#hide).
+
+### `trayIcon.setIcon(icon)`
+
+Sets the icon of system tray. It calls the native method [QSystemTrayIcon: setIcon](https://doc.qt.io/qt-5/QSystemTrayIcon.html#icon-prop).
+
+- `icon` [QIcon](api/QIcon.md)
+
+### `trayIcon.isVisible()`
+
+Returns the visibility of icon. It calls the native method [QSystemTrayIcon: setIcon](https://doc.qt.io/qt-5/QSystemTrayIcon.html#visible-prop).

website/sidebars.js

@@ -15,6 +15,7 @@ module.exports = {
       "api/QRadioButton",
       "api/QScrollArea",
       "api/QSpinBox",
+      "api/QSystemTrayIcon",
       "api/QTabWidget",
       "api/QWidget"
     ],