feat: lesion-tracker extension (#1420)

* chore: init lesion-tracker extension

* chore: dev build for lesion-tracker extension

* fix: a more appropriate library name

* chore: fix script naming

platform/viewer/src/index-lesion-tracker.js

@@ -0,0 +1,46 @@
+/**
+ * Entry point for development and production PWA builds.
+ * Packaged (NPM) builds go through `index-umd.js`
+ */
+
+import 'regenerator-runtime/runtime';
+
+import App from './App.js';
+import React from 'react';
+import ReactDOM from 'react-dom';
+
+/**
+ * EXTENSIONS
+ * =================
+ *
+ * Importing and modifying the extensions our app uses HERE allows us to leverage
+ * tree shaking and a few other niceties. However, by including them here they become
+ * "baked in" to the published application.
+ *
+ * Depending on your use case/needs, you may want to consider not adding any extensions
+ * by default HERE, and instead provide them via the extensions configuration key or
+ * by using the exported `App` component, and passing in your extensions as props using
+ * the defaultExtensions property.
+ */
+import OHIFLesionTrackerExtension from '@ohif/extension-lesion-tracker';
+import OHIFDicomPDFExtension from '@ohif/extension-dicom-pdf';
+
+/*
+ * Default Settings
+ */
+let config = {};
+
+if (window) {
+  config = window.config || {};
+}
+
+const appProps = {
+  config,
+  defaultExtensions: [OHIFLesionTrackerExtension, OHIFDicomPDFExtension],
+};
+
+/** Create App */
+const app = React.createElement(App, appProps, null);
+
+/** Render */
+ReactDOM.render(app, document.getElementById('root'));