#Thumbnail displays a small sized image

default width: app.sizes.xxxLarge * 3
default height: app.sizes.xxxLarge * 3
default fillMode: Image.PreserveAspectFit

###Example

    Thumbnail {
        id: thumb
        picture: uploadThumbnail.picture
        fillMode: Image.Stretch
        onClicked: console.log("Thumbnail clicked")
    }

##Properties

###marker: string This property holds a number or a string to be displayed if no image loaded

###picture: string This property holds the path of the image to be displayed

##Signals

###clicked This signal will be emitted when Thumbnail is clicked