Add example file

Howard2.json

@@ -0,0 +1,34 @@
+{
+  "revision": 3,
+  "type": "Timed event graph",
+  "nets": [
+    {
+       "name": "Howard2",
+       "places": [
+            { "id": 0, "caption": "P0", "tokens": 2, "x": 208, "y": 250 },
+            { "id": 1, "caption": "P1", "tokens": 0, "x": 562, "y": 276 },
+            { "id": 2, "caption": "P2", "tokens": 0, "x": 304, "y": 398 },
+            { "id": 3, "caption": "P3", "tokens": 0, "x": 650, "y": 200 },
+            { "id": 4, "caption": "P4", "tokens": 0, "x": 428, "y": 550 }
+       ],
+       "transitions": [
+            { "id": 0, "caption": "T0", "x": 320, "y": 128, "angle": 0 },
+            { "id": 1, "caption": "T1", "x": 458, "y": 398, "angle": 0 },
+            { "id": 2, "caption": "T2", "x": 120, "y": 388, "angle": 0 },
+            { "id": 3, "caption": "T3", "x": 734, "y": 406, "angle": 0 }
+       ],
+       "arcs": [
+            { "from": "P0", "to": "T0" },
+            { "from": "T0", "to": "P1", "duration": 5 },
+            { "from": "P1", "to": "T1" },
+            { "from": "T1", "to": "P2", "duration": 3 },
+            { "from": "P2", "to": "T2" },
+            { "from": "T2", "to": "P0", "duration": 5 },
+            { "from": "T0", "to": "P3", "duration": 1 },
+            { "from": "P3", "to": "T3" },
+            { "from": "T3", "to": "P4", "duration": 1 },
+            { "from": "P4", "to": "T2" }
+       ]
+    }
+  ]
+}