Updated Button (markdown)

Button.md

@@ -1 +1,22 @@
-WIP
+Buttons are a objects, which execute function by clicking on them
+
+Here is a example of how to create a standard button:
+
+````lua
+local mainFrame = CreateFrame("myFirstFrame"):show()
+local aButton = mainFrame:addButton("myFirstButton"):show()
+````
+
+This will create a default button with the size 5 width and 1 height on position 1 1 (relative to its parent frame), the default background is colors.lightBlue, the default text color is colors.black and the
+default zIndex is 5. The default vertical and horizontal text aligns are "center" - but there is no default text.
+
+Here are all possible functions available for buttons. Remember button inherit from [object](https://github.com/NoryiE/NyoUI/wiki/Object):
+
+## setText
+Sets the displayed button text
+````lua
+local mainFrame = CreateFrame("myFirstFrame"):show()
+local aButton = mainFrame:addButton("myFirstButton"):setText("Click"):show() -- you could also use :setValue() instead of :setText() - no difference
+````
+**args:** text<br>
+**returns:** the object<br>