Add "Sliding Window" missing problems (seanprashad#282)

Update questions.json

Signed-off-by: Stanislav (Stanley) Modrak <[email protected]>

Author: smith558

src/data/questions.json

@@ -8220,6 +8220,51 @@
       "difficulty": "Medium",
       "premium": false,
       "companies": []
+    },
+    {
+      "id": 176,
+      "title": "Maximum Average Subarray I",
+      "slug": "maximum-average-subarray-i",
+      "pattern": [
+        "Sliding Window"
+      ],
+      "difficulty": "Easy",
+      "premium": false,
+      "companies": []
+    },
+    {
+      "id": 177,
+      "title": "Maximum Number of Vowels in a Substring of Given Length",
+      "slug": "maximum-number-of-vowels-in-a-substring-of-given-length",
+      "pattern": [
+        "Sliding Window"
+      ],
+      "difficulty": "Medium",
+      "premium": false,
+      "companies": []
+    },
+    {
+      "id": 178,
+      "title": "Max Consecutive Ones III",
+      "slug": "max-consecutive-ones-iii",
+      "pattern": [
+        "Sliding Window"
+      ],
+      "difficulty": "Medium",
+      "premium": false,
+      "companies": []
+    },
+    {
+      "id": 179,
+      "title": "Longest Subarray of 1's After Deleting One Element",
+      "slug": "longest-subarray-of-1s-after-deleting-one-element",
+      "pattern": [
+        "Sliding Window",
+        "Dynamic Programming"
+      ],
+      "difficulty": "Medium",
+      "premium": false,
+      "companies": []
     }
   ]
-}
+}