Add VertexColorNode (#750)

types/three/examples/jsm/nodes/Nodes.d.ts

@@ -190,6 +190,7 @@ export {
     cameraPosition,
     CameraNodeScope,
 } from './accessors/CameraNode.js';
+export { default as VertexColorNode, vertexColor } from './accessors/VertexColorNode.js';
 export { default as CubeTextureNode, cubeTexture } from './accessors/CubeTextureNode.js';
 export { default as InstanceNode, instance } from './accessors/InstanceNode.js';
 export {

types/three/examples/jsm/nodes/accessors/VertexColorNode.d.ts

@@ -0,0 +1,12 @@
+import { ShaderNodeObject } from '../shadernode/ShaderNode.js';
+import AttributeNode from '../core/AttributeNode.js';
+
+export default class VertexColorNode extends AttributeNode {
+    readonly isVertexColorNode: true;
+
+    index: number;
+
+    constructor(index?: number);
+}
+
+export const vertexColor: (index?: number) => ShaderNodeObject<VertexColorNode>;