ES6: port datepicker and util to ES6

Change-Id: I203aa47229e6c4dacd3a33bea39c512f4576a182
diff --git a/dev/js/src-lib/datepicker/package.json b/dev/js/src-lib/datepicker/package.json
new file mode 100644
index 0000000..e74fb87
--- /dev/null
+++ b/dev/js/src-lib/datepicker/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "kalamar-datepicker",
+  "version": "0.0.1",
+  "description": "Datepicker for Kalmar",
+  "main": "datepicker.js",
+  "scripts": {
+    "dev": "vite --open /demo/index.html"
+  },
+  "author": "",
+  "license": "ISC"
+}