Add bundling-modeler example

bundling-modeler/.gitignore

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+node_modules/
+dist/
+tmp/

bundling-modeler/README.md

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+# dmn-js bundling-modeler example
+
+This example showcases how to add [dmn-js](https://github.com/bpmn-io/dmn-js) modeler
+into a node-style application and bundle it for the browser using
+[Webpack](https://webpack.js.org).
+
+
+## About
+
+This example uses dmn-js to embed the [dish-decision](https://demo.bpmn.io/dmn/s/check-order) diagram into a web application.
+
+![example screenshot](./resources/screenshot.png "Screenshot of the example application")
+
+
+## Usage Summary
+
+Install dmn-js via [npm](http://npmjs.org)
+
+```
+npm install --save dmn-js
+```
+
+Use it in your application
+
+```javascript
+const dmnJS = new DmnViewer({
+  container: '#canvas'
+});
+
+try {
+  const { warnings } = await dmnJS.importXML(xml);
+
+  if (warnings.length) {
+    console.log('import with warnings', warnings);
+  } else {
+    console.log('import successful');
+  }
+
+  dmnJS
+    .getActiveViewer()
+      .get('canvas')
+        .zoom('fit-viewport');
+} catch (err) {
+  console.log('something went wrong:', err);
+}
+```
+
+Add an appropriate loader that understands the ES modules that [dmn-js](http://github.com/bpmn-io/dmn-js) ships with.
+
+Webpack, as seen in [the example](./webpack.config.js) understands ES modules out of the box and will combine the sources to a cross-browser understandable ES5 bundle.
+
+Bundle the `src/app.js` file for the browser with webpack:
+
+```
+webpack ./src/app.js -o public/app.bundled.js --mode development
+```
+
+To learn about more bundling options, checkout the [webpack-cli documentation](https://webpack.js.org/api/cli/).
+
+__Note:__ You may use another bundling setup, too. Options include, among others, Rollup or Browserify + Babelify.
+
+
+## Building the Example
+
+Initialize the project dependencies via
+
+```
+npm install
+```
+
+To create the sample distribution in the `public` folder run
+
+```
+npm run all
+```
+
+
+## License
+
+MIT