Snippet format update

To match the starter (for the migration)

snippets/createDirIfNotExists.md

@@ -1,4 +1,7 @@
-### createDirIfNotExists
+---
+title: createDirIfNotExists
+tags: node,beginner
+---
 
 Creates a directory, if it does not exist.
 
@@ -11,4 +14,4 @@ const createDirIfNotExists = dir => (!fs.existsSync(dir) ? fs.mkdirSync(dir) : u
 
 ```js
 createDirIfNotExists('test'); // creates the directory 'test', if it doesn't exist
-```
+```