Update arirang.com

sites/arirang.com/arirang.com.test.js

@@ -1,6 +1,3 @@
-// npm run grab -- --site=arirang.com
-// npx jest arirang.com.test.js
-
 const { url, parser } = require('./arirang.com.config.js')
 const fs = require('fs')
 const path = require('path')

sites/arirang.com/readme.md

@@ -0,0 +1,15 @@
+# arirang.com
+
+https://arirang.com/schedule
+
+### Download the guide
+
+```sh
+npm run grab -- --site=arirang.com
+```
+
+### Test
+
+```sh
+npm test -- arirang.com
+```