Add example for running SatSim in NodeJS.

app/app.js

@@ -0,0 +1,18 @@
+import { Universe, applyIau2006XysDataPatch } from "../src/index.js";
+import { JulianDate } from "cesium";
+
+applyIau2006XysDataPatch();  // required when running in nodejs
+
+const universe = new Universe();
+const start = JulianDate.now();
+const end = JulianDate.addSeconds(start, 60*60, new JulianDate());
+universe.update(start);
+console.log('starting simulation at', start.toString());
+
+// Run the simulation from start to end
+for (let t = start.clone(); JulianDate.compare(t, end) < 0; t = JulianDate.addSeconds(t, 60, new JulianDate())) {
+    universe.update(t);
+    console.log(universe._earth.transform.toString());
+}
+
+console.log('simulation complete at', end.toString());

webpack.config.js

@@ -21,7 +21,7 @@ export default {
         sourcePrefix: ''
     },
     resolve: {
-        fallback: { "https": false, "zlib": false, "http": false, "url": false },
+        fallback: { "https": false, "zlib": false, "http": false, "url": false, "fs": false },
         mainFiles: ['index', 'Cesium'],
         // add satsim as an alias to the root directory
         alias: {