Added a new demo which shows how to make custom nodes

demos/demo3/DiamondInstanceFactories.ts

@@ -0,0 +1,25 @@
+import * as SRD from "../../src/main";
+import {DiamondNodeModel} from "./DiamondNodeModel";
+import {DiamondPortModel} from "./DiamondPortModel";
+
+export class DiamondNodeFactory extends SRD.AbstractInstanceFactory<DiamondNodeModel>{
+	
+	constructor(){
+		super("DiamondNodeModel");
+	}
+	
+	getInstance(){
+		return new DiamondNodeModel();
+	}
+}
+
+export class DiamondPortFactory extends SRD.AbstractInstanceFactory<DiamondPortModel>{
+	
+	constructor(){
+		super("DiamondPortModel");
+	}
+	
+	getInstance(){
+		return new DiamondPortModel();
+	}
+}