feat: add cats-childrens-of-childrens challenge

challenges/cats-childrens-of-childrens/README.md

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+# cats-childrens-of-childrens
+
+Created by [@Divlo](https://github.com/Divlo) on 12 September 2020.
+
+## Instructions :
+
+Write a function that allows you to get all the cat names in a single array.
+
+The order, number and levels of subfolders are frequently changed, so we want a solution that adapts to these changes.
+
+## Source :
+
+[jesuisundev.com/comprendre-la-recursivite-en-7-min](https://www.jesuisundev.com/comprendre-la-recursivite-en-7-min/)
+
+## Examples :
+
+See the `input-output.json` file for examples of input/output.

challenges/cats-childrens-of-childrens/input-output.json

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+[
+  {
+    "input": [
+      [
+        {
+          "type": "folder",
+          "name": "cats",
+          "children": [
+            {
+              "type": "image",
+              "name": "Buffy"
+            },
+            {
+              "type": "image",
+              "name": "Gizmo"
+            },
+            {
+              "type": "folder",
+              "name": "small-cat",
+              "children": [
+                {
+                  "type": "image",
+                  "name": "Fluffy"
+                },
+                {
+                  "type": "image",
+                  "name": "Harry"
+                },
+                {
+                  "type": "folder",
+                  "name": "black-cat",
+                  "children": [
+                    {
+                      "type": "image",
+                      "name": "Daisy"
+                    },
+                    {
+                      "type": "image",
+                      "name": "Toby"
+                    }
+                  ]
+                },
+                {
+                  "type": "folder",
+                  "name": "white-cat",
+                  "children": [
+                    {
+                      "type": "image",
+                      "name": "Minnie"
+                    },
+                    {
+                      "type": "image",
+                      "name": "Lucy"
+                    }
+                  ]
+                }
+              ]
+            },
+            {
+              "type": "folder",
+              "name": "future-cat",
+              "children": []
+            }
+          ]
+        }
+      ]
+    ],
+    "output": [
+      "Buffy",
+      "Gizmo",
+      "Fluffy",
+      "Harry",
+      "Daisy",
+      "Toby",
+      "Minnie",
+      "Lucy"
+    ]
+  }
+]

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