add new icons and an example file

testTopology.etd

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+<mxGraphModel><root><mxCell id="0"/><mxCell id="1" parent="0"/><mxCell id="2" parent="1" serverid="1" style="image;image=/com/mxgraph/examples/swing/images/node/server.png" value="Edge Server #1" vertex="1" warningmessage="Using auto-generated Server ID: 1"><mxGeometry as="geometry" height="50.0" width="50.0" x="100.0" y="320.0"/></mxCell><mxCell id="3" parent="1" serverid="2" style="image;image=/com/mxgraph/examples/swing/images/node/server.png" value="Edge Server #2" vertex="1" warningmessage="Using auto-generated Server ID: 2"><mxGeometry as="geometry" height="50.0" width="50.0" x="230.0" y="320.0"/></mxCell><mxCell edge="1" id="9" parent="1" source="2" style="image=/com/mxgraph/examples/swing/images/node/server.png;startArrow=classic" target="3" value="1"><mxGeometry as="geometry" relative="1"><mxPoint as="sourcePoint" x="130.0" y="350.0"/><mxPoint as="targetPoint" x="260.0" y="350.0"/></mxGeometry></mxCell><mxCell id="11" parent="1" serverid="10" style="image;image=/com/mxgraph/examples/swing/images/node/telephone.png" value="End Device #10" vertex="1" warningmessage="Using auto-generated ID: 10"><mxGeometry as="geometry" height="50.0" width="50.0" x="100.0" y="460.0"/></mxCell><mxCell edge="1" id="12" parent="1" source="11" style="" target="2" value="1"><mxGeometry as="geometry" relative="1"><mxPoint as="sourcePoint" x="130.0" y="490.0"/><mxPoint as="targetPoint" x="110.0" y="370.0"/></mxGeometry></mxCell><mxCell connectable="0" id="17" parent="1" style="fillColor=#003333;gradientColor=#000000;fontColor=#FFFFFF;align=center;verticalAlign=top" value="Fallback Servers" vertex="1"><mxGeometry as="geometry" height="350.0" width="220.0" x="370.0" y="240.0"/></mxCell><mxCell id="5" parent="17" serverid="3" style="image;image=/com/mxgraph/examples/swing/images/node/server.png" value="Edge Server #3" vertex="1" warningmessage="Using auto-generated Server ID: 3"><mxGeometry as="geometry" height="50.0" width="50.0" x="130.0" y="200.0"><mxPoint as="offset" x="-16.0" y="9.0"/></mxGeometry></mxCell><mxCell id="13" parent="17" serverid="4" style="image;image=/com/mxgraph/examples/swing/images/node/server.png" value="Edge Server #4" vertex="1" warningmessage="Using auto-generated Server ID: 4"><mxGeometry as="geometry" height="50.0" width="50.0" x="130.0" y="60.0"><mxPoint as="offset" x="-81.0" y="-38.0"/></mxGeometry></mxCell><mxCell edge="1" id="20" parent="17" source="13" style="startArrow=classic" target="5" value="1"><mxGeometry as="geometry" relative="1"><mxPoint as="sourcePoint" x="90.0" y="50.0"/><mxPoint as="targetPoint" x="90.0" y="170.0"/></mxGeometry></mxCell><mxCell edge="1" id="21" parent="1" source="3" style="startArrow=classic" target="5" value="1"><mxGeometry as="geometry" relative="1"><mxPoint as="sourcePoint" x="260.0" y="350.0"/><mxPoint as="targetPoint" x="460.0" y="390.0"/><Array as="points"><mxPoint x="340.0" y="420.0"/></Array></mxGeometry></mxCell><mxCell edge="1" id="22" parent="1" source="2" style="strokeColor=#CC0033;dashed=1;startArrow=classic" target="13" value="5"><mxGeometry as="geometry" relative="1"><mxPoint as="sourcePoint" x="130.0" y="350.0"/><mxPoint as="targetPoint" x="540.0" y="320.0"/><Array as="points"><mxPoint x="240.0" y="180.0"/></Array></mxGeometry></mxCell></root></mxGraphModel>

testTopology.txt

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+# Topology file is converted using Edge Topology Designer
+Node,1,Edge Server #1,Using auto-generated Server ID: 1
+Node,2,Edge Server #2,Using auto-generated Server ID: 2
+Connection,1,2,1
+Node,10,End Device #10,Using auto-generated ID: 10
+Connection,10,1,1
+Node,3,Edge Server #3,Using auto-generated Server ID: 3
+Node,4,Edge Server #4,Using auto-generated Server ID: 4
+Connection,4,3,1
+Connection,2,3,1
+Connection,1,4,5