Move backend files to backend/ subdirectory

backend/modules/logger.js

@@ -0,0 +1,22 @@
+const winston = require('winston');
+
+var logger = new (winston.Logger)({
+  transports: [
+    new (winston.transports.File)({
+      name: 'debug-file',
+      filename: 'urge-debug.log',
+      handleExceptions: true,
+      humanReadableUnhandledException: true,
+      level: 'debug'
+    }),
+    new (winston.transports.File)({
+      name: 'error-file',
+      filename: 'urge-error.log',
+      handleExceptions: true,
+      humanReadableUnhandledException: true,
+      level: 'error'
+    })
+  ]
+});
+
+module.exports = logger;