add react-express-mysql application sample

Signed-off-by: Anca Iordache <anca.iordache@docker.com>

samples/react-express-mysql/frontend/webpack/dev-server.js

@@ -0,0 +1,38 @@
+'use strict';
+
+const webpack = require('webpack'),
+      WebpackDevServer = require('webpack-dev-server'),
+      makeConfig = require("./config-builder");
+
+const startWebpackServer = () => {
+    const config = makeConfig('development');
+
+    const SERVER_PORT = 9000;
+
+    new WebpackDevServer(webpack(config), {
+        publicPath          : config.output.publicPath,
+        hot                 : true,
+        historyApiFallback  : true,
+        contentBase         : "./build/",
+
+        watchOptions: { // no file events on D4W
+            aggregateTimeout: 300,
+            poll: 1000
+        },
+
+        proxy : {
+            "/api/*"       : "http://127.0.0.1:8080"  // proxy to backend
+        },
+
+        before : function(app) {
+            // manually configure app `app.use(...)`
+        }
+    }).listen(SERVER_PORT, '0.0.0.0', function (err, result) {
+        if (err) {
+            console.log(err);
+        }
+        console.log('Webpack dev server listening at localhost:' + SERVER_PORT);
+    });
+};
+
+startWebpackServer();