Add cats.json file which is required for at least 5 challenges (#179)

packages/learn/static/json/cats.json

@@ -0,0 +1,21 @@
+[
+  {
+    "id": 0,
+    "imageLink": "https://s3.amazonaws.com/freecodecamp/funny-cat.jpg",
+    "altText": "A white cat wearing a green, helmet shaped melon on its head. ",
+    "codeNames": ["Juggernaut", "Mrs. Wallace", "Buttercup"]
+  },
+  {
+    "id": 1,
+    "imageLink": "https://s3.amazonaws.com/freecodecamp/grumpy-cat.jpg",
+    "altText": "A white cat with blue eyes, looking very grumpy. ",
+    "codeNames": ["Oscar", "Scrooge", "Tyrion"]
+  },
+  {
+    "id": 2,
+    "imageLink": "https://s3.amazonaws.com/freecodecamp/mischievous-cat.jpg",
+    "altText":
+      "A ginger cat with one eye closed and mouth in a grin-like expression. Looking very mischievous. ",
+    "codeNames": ["The Doctor", "Loki", "Joker"]
+  }
+]