feat: add cats-childrens-of-childrens challenge

challenges/cats-childrens-of-childrens/solutions/javascript-recursive/README.md

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+# javascript-recursive - cats-childrens-of-childrens
+
+Programming language : JavaScript
+
+Created by [@Divlo](https://github.com/Divlo) on 12 September 2020.

challenges/cats-childrens-of-childrens/solutions/javascript-recursive/solution.js

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+function solution (folders, result = []) {
+  for (const folder of folders) {
+    if (folder.type === 'image') {
+      result.push(folder.name)
+    } else if (folder.type === 'folder') {
+      solution(folder.children, result)
+    }
+  }
+  return result
+}
+
+module.exports = solution