Add gulpfile with browser-sync.

.gitignore

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+node_modules

gulpfile.js

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+var gulp = require('gulp');
+var browserSync = require('browser-sync').create();
+
+gulp.task('serve', function() {
+  browserSync.init({
+    server: {
+      baseDir: "./"
+    },
+  });
+
+  gulp.watch(['*.html', '*.css', '*.js']).on('change', browserSync.reload);
+});

package.json

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+{
+  "name": "agent-mockup",
+  "dependencies": {
+    "browser-sync": "^2.11.0",
+    "gulp": "^3.9.0"
+  }
+}