Add dev server script

tests/server.js

@@ -0,0 +1,41 @@
+const express = require('express');
+const cors = require('cors');
+const path = require('path');
+const fs = require('fs');
+const webpack = require('webpack');
+const config = require('../webpack.config');
+const serveIndex = require('serve-index');
+
+const PORT = 8080;
+const CORS_PORT = 8081;
+
+const app = express();
+app.use('/', serveIndex(path.resolve(__dirname, '../'), {icons: true}));
+app.use('/', express.static(path.resolve(__dirname, '../')));
+app.listen(PORT, () => {
+    console.log(`Server running on port ${PORT}`);
+});
+
+const corsApp = express();
+corsApp.use(cors());
+corsApp.use('/', express.static(path.resolve(__dirname, '../')));
+corsApp.listen(CORS_PORT, () => {
+    console.log(`CORS server running on port ${CORS_PORT}`);
+});
+
+const compiler = webpack(config);
+compiler.watch(
+    {
+        aggregateTimeout: 300 // wait so long for more changes
+    },
+    (err, stats) => {
+        console.error(err);
+
+        console.log(
+            stats.toString({
+                chunks: false, // Makes the build much quieter
+                colors: true
+            })
+        );
+    }
+);