added operators to TableRowBuilder

Tablet/TableRowBuilder.swift

@@ -162,3 +162,13 @@ public extension TableRowBuilder {
         items.removeAll()
     }
 }
+
+public func +=<I, C>(left: TableRowBuilder<I, C>, right: I) {
+    
+    left.appendItems([right])
+}
+
+public func +=<I, C>(left: TableRowBuilder<I, C>, right: [I]) {
+
+    left.appendItems(right)
+}

TabletDemo/TabletDemo/ViewController.swift

@@ -32,6 +32,7 @@ class ViewController: UIViewController {
                 print("end display: \(data.indexPath)")
             }
         
+
         let configurableRowBuilder = TableConfigurableRowBuilder<String, ConfigurableTableViewCell>(items: ["5", "6", "7", "8"], estimatedRowHeight: 300)
             .action(.click) { data -> Void in