feat(guide): Import guide in to the client app

client/utils/readDir.js

@@ -0,0 +1,10 @@
+const fse = require('fs-extra');
+
+const { isAFileRE, shouldBeIgnoredRE } = require('./regEx.js');
+
+module.exports = function readDir(dir) {
+  return fse
+    .readdirSync(dir)
+    .filter(item => !isAFileRE.test(item))
+    .filter(file => !shouldBeIgnoredRE.test(file));
+};