Added documentation

docs/api/QIcon.md

@@ -0,0 +1,32 @@
+## Class: QIcon
+
+> The QIcon class provides scalable icons in different modes and states.
+
+**This class is a JS wrapper around Qt's [QIcon class](https://doc.qt.io/qt-5/qicon.html)**
+
+**QIcon inherits from [Component](api/Component.md)**
+
+### Example
+
+```javascript
+const { QIcon } = require("@nodegui/nodegui");
+
+const imageUrl = "path/to/png";
+const icon = new QIcon(imageUrl);
+```
+
+### `new QIcon(imageUrl?)`
+
+- `imageUrl` string (_optional_). Absolute path of the image that needs to be loaded in the memory.
+
+### Static Methods
+
+QIcon can access all the static methods defined in [Component](api/Component.md)
+
+### Instance Properties
+
+QIcon can access all the instance properties defined in [Component](api/Component.md)
+
+### Instance Methods
+
+QIcon can access all the instance methods defined in [Component](api/Component.md)

docs/api/QPushButton.md

@@ -45,4 +45,10 @@ Sets the given text to the button.
 
 Sets whether the button border is raised.
 
-- `isFlat` boolean
+- `isFlat` boolean
+
+#### `button.setIcon(icon)`
+
+Sets an icon in the button.
+
+- `icon` QIcon