start adding some features

frontend/src/app.js

@@ -0,0 +1,26 @@
+const express = require( 'express' );
+let app = express();
+const path = require( 'path' );
+const fs = require( 'fs' );
+const bodyParser = require( 'body-parser' );
+const dialog = require( 'electron' ).dialog;
+
+app.use( bodyParser.urlencoded( { extended: false } ) );
+app.use( bodyParser.json() );
+
+
+app.get( '/', ( request, response ) => {
+    response.send( 'Hello world' );
+} );
+
+
+app.get( '/openSongs', ( req, res ) => {
+    res.send( { 'data': dialog.showOpenDialogSync( { properties: [ 'openDirectory' ], title: 'Open music library folder' } ) } );
+} );
+
+
+app.use( ( request, response, next ) => {
+    response.sendFile( path.join( __dirname + '' ) ) 
+} );
+
+app.listen( 8081 );