Add link on build3d.js demo ii api.htm

Author: linev

api.htm

@@ -450,6 +450,7 @@ <h1><div><a href="https://root.cern/js/">JSROOT</a></div><a id="version" href="h
             { name: 'Images', title: 'Example of SVG, PNG, JPEG image creations with makeImage() function', src: 'demo/node/make_image.js', srcload: 'github' },
             { name: 'TTree draw', title: 'Example of TTree::Draw in node.js', src: 'demo/node/tree_draw.js', srcload: 'github' },
             { name: 'TTree dump', title: 'Example shows usage of TTree::Draw for values dump', src: 'demo/node/tree_dump.js', srcload: 'github' },
+            { name: 'Threejs model', title: 'How to create three.js model for different classes using build3d function', src: 'demo/node/build3d.js', srcload: 'github' },
             { name: 'Selector', title: 'How to use TSelector class in node.js', src: 'demo/node/selector.js', srcload: 'github' },
             { name: 'Testing', title: 'JSROOT test suite with Node.js', src: 'https://github.com/linev/jsroot-test/', srcload: 'https://raw.githubusercontent.com/linev/jsroot-test/' + GetGithubBrunch(true) + 'test.js' }
           ],