Added seed file for test data.

src/argv.js

@@ -161,6 +161,11 @@ const { argv } = yargs
         describe: 'Show error stack traces',
         type: 'boolean',
         default: process.env.NODE_ENV === 'development',
+    })
+    .option('dummy', {
+        describe: 'Generate dummy data during seed',
+        type: 'boolean',
+        default: false,
     });
 
 module.exports = argv;