Demo.md

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+```
+
+import { Polyline } from "webcad-api";
+import { Vector3 } from "three";
+let polyline = new Polyline();
+polyline.RectangleFrom2Pt(new Vector3(0, 0, 0), new Vector3(100, 100, 0));
+console.log(polyline);
+
+console.log(polyline.Area);
+console.log(polyline.GetOffsetCurves(3));
+```
+