Add 'Clip round rectangles'

Clip-round-rectangles.md

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+### Using the clip property to crop child objects inside Item or Rectangle
+https://evileg.com/en/post/577/
+
+### Short Version
+
+```
+import QtQuick 2.12
+import QtQuick.Controls 2.12
+import QtGraphicalEffects 1.0
+
+Item{
+    id: root
+
+    width: parent.width
+    height: parent.height
+
+    Rectangle{
+        id: itemDelegate
+        width: 300
+        height: 96
+        color: "#1aebebeb"
+        radius: height/4
+        border.color: "#9de000"
+        clip: true
+
+        layer.enabled: true
+        layer.effect: OpacityMask {
+            maskSource: Item {
+                width: itemDelegate.width
+                height: itemDelegate.height
+                Rectangle {
+                    anchors.centerIn: parent
+                    width: itemDelegate.width
+                    height: itemDelegate.height
+                    radius: itemDelegate.radius
+                }
+            }
+        }
+
+        Rectangle{
+            width: parent.width*0.25
+            height: parent.height
+            color: "#9de000"
+        }
+
+        Row{
+            width: parent.width
+            height: parent.height
+        }
+    }
+}
+
+```