Add base map code

This was built with `npm create ol-app my-app`.

main.js

@@ -0,0 +1,17 @@
+import './style.css';
+import {Map, View} from 'ol';
+import TileLayer from 'ol/layer/Tile';
+import OSM from 'ol/source/OSM';
+
+const map = new Map({
+  target: 'map',
+  layers: [
+    new TileLayer({
+      source: new OSM()
+    })
+  ],
+  view: new View({
+    center: [0, 0],
+    zoom: 2
+  })
+});