Add topics to problem kindergarten-garden (#867)

* Completes #853

* Add more topics to problem Kindergarten-garden

* Correct the identation

* Correct the identation again

config.json

       "core": false,
       "difficulty": 4,
       "slug": "kindergarten-garden",
-      "topics": null,
+      "topics": [
+        "loops",
+        "arrays",
+        "strings",
+        "logic",
+        "pattern_recognition",
+        "enumerations",
+        "lists"
+      ],
       "unlocked_by": "matrix",
       "uuid": "0b92ffee-c092-4ab1-ad78-76c8cf80e1b5"
     },