Added an example of using the QtObject macro

Nim/Examples/SimpleMacro/CMakeLists.txt

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+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/main.qml DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
+add_nim_executable(TARGET Main SOURCES main.nim PATHS ../../NimQml)

Nim/Examples/SimpleMacro/main.nim

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+## This example replicates the functionality of Examples/Simple but uses
+## the helper macro, QtObject, from NimQmlMacros, to remove some of the boiler plate. 
+## Please note we are using templates where ordinarily we would like to use procedures
+## due to bug: https://github.com/Araq/Nim/issues/1821
+
+import NimQml, NimQmlMacros
+
+QtObject:
+  type MyQObject = ref object of QObject
+    m_name: string
+
+  template newMyQObject(initial: string): MyQObject =
+    var result = MyQObject(m_name: initial)
+    result.create
+    result
+  
+  method getName(myQObject: MyQObject): string {.slot.} =
+    echo "nameChanged"
+    result = myQObject.m_name
+
+  method nameChanged(myQObject: MyQObject) {.signal.}
+  
+  method setName(myQObject: MyQObject, name: string) {.slot.} =
+    echo "setName"
+    if myQObject.m_name != name:
+      myQObject.m_name = name
+      myQObject.nameChanged()
+  
+  QtProperty name of string:
+    read = getName
+    write = setName
+    notify = nameChanged
+
+proc mainProc() =
+  var app: QApplication
+  app.create()
+  defer: app.delete()
+   
+  var myQObject = newMyQObject("InitialName")
+  defer: myQObject.delete() 
+
+  var engine: QQmlApplicationEngine
+  engine.create()
+  defer: engine.delete()
+
+  var variant: QVariant
+  variant.create(myQObject)
+  defer: variant.delete()
+
+  var rootContext: QQmlContext = engine.rootContext()
+  rootContext.setContextProperty("myQObject", variant)
+  engine.load("main.qml")
+  app.exec()
+
+when isMainModule:
+  mainProc()
+

Nim/Examples/SimpleMacro/main.qml

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+import QtQuick 2.2
+import QtQuick.Controls 1.2
+import QtQuick.Layouts 1.1
+import QtQuick.Window 2.1
+
+ApplicationWindow
+{
+	width: 400
+	height: 300
+
+	Component.onCompleted: visible = true
+
+	ColumnLayout
+	{
+	    anchors.fill: parent
+
+	    Label
+	    {
+	        text: "Current name is:" + myQObject.name
+	    }
+
+	    TextField
+	    {
+	        id: textField
+	    }
+
+	    Button
+	    {
+	        text: "Change Name"
+	        onClicked: {
+	            console.log("QML:", textField.text)
+	            myQObject.name = textField.text 
+	        }
+	    }
+	}
+}