Node.createChild(data, name): can create named child nodes

# Conflicts:
#	src/test/java/net/kemitix/node/NodeItemTest.java

src/main/java/net/kemitix/node/Node.java

@@ -88,6 +88,15 @@ public interface Node<T> {
      */
     Node<T> createChild(T child);
 
+    /**
+     * Creates a new named node and adds it as a child of the current node.
+     *
+     * @param child the child node's data
+     *
+     * @return the new child node
+     */
+    Node<T> createChild(T child, String name);
+
     /**
      * Populates the tree with the path of nodes, each being a child of the
      * previous node in the path.

src/main/java/net/kemitix/node/NodeItem.java

@@ -189,6 +189,13 @@ public class NodeItem<T> implements Node<T> {
         return new NodeItem<>(child, this);
     }
 
+    @Override
+    public Node<T> createChild(final T child, final String name) {
+        Node<T> node = createChild(child);
+        node.setName(name);
+        return node;
+    }
+
     /**
      * Populates the tree with the path of nodes, each being a child of the
      * previous node in the path.

src/test/java/net/kemitix/node/NodeItemTest.java

@@ -888,4 +888,17 @@ public class NodeItemTest {
         //then
         assertThat(node.getData()).isEqualTo("updated");
     }
+
+    @Test
+    @SuppressWarnings("unchecked")
+    public void canCreateNamedChild() {
+        //given
+        node = new NodeItem<>(null);
+        //when
+        Node<String> child = node.createChild("child data", "child name");
+        //then
+        assertThat(child.getName()).isEqualTo("child name");
+        assertThat(child.getParent()).isSameAs(node);
+        assertThat(node.getChildren()).containsExactly(child);
+    }
 }