Updated Dropdown (markdown)

Dropdown.md

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-WIP
+Dropdowns are objects which looks like a button, but as soon as you click on them, they will open a dropdown where you can choose a value. But first you will have to add possible values
+
+Here is a example of how to create a standard dropdown:
+
+````lua
+local mainFrame = NyoUI.createFrame("myFirstFrame"):show()
+local aDropdown = mainFrame:addDropdown("myFirstDropdown"):show()
+````
+
+This will create a default dropdown 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 10. The default horizontal text align is "center"
+
+Here are all possible functions available for dropdowns. Remember dropdown inherit from [object](https://github.com/NoryiE/NyoUI/wiki/Object):
+
+## addItem
+Adds a item to the list
+
+````lua
+local mainFrame = NyoUI.createFrame("myFirstFrame"):show()
+local aDropdown = mainFrame:addDropdown("myFirstDropdown"):show()
+aDropDown:addItem("1. Entry")
+aDropDown:addItem("2. Entry",colors.yellow)
+aDropDown:addItem("3. Entry",colors.yellow,colors.green)
+````
+**args:** text, bgcolor, fgcolor, ..., text is the displayed text, bgcolor and fgcolors the colors of background/text and args (...) is something dynamic, you wont see them but if you require some more information per item you can use that.<br>
+**returns:** the object<br>