Add problems

Author: neetcode-gh

.problemList.json

@@ -80,6 +80,11 @@
           "https://leetcode.com/problems/find-pivot-index/",
           "0724"
        ],
+       [
+         "Range Sum Query - Immutable",
+         "https://leetcode.com/problems/range-sum-query-immutable/",
+         "0303"
+       ],
        [
           "Find All Numbers Disappeared In An Array",
           "https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/",
@@ -95,6 +100,11 @@
           "https://leetcode.com/problems/word-pattern/",
           "0290"
        ],
+       [
+         "Design HashMap",
+         "https://leetcode.com/problems/design-hashmap/",
+         "0706"
+       ],
        [
           "Top K Frequent Elements",
           "https://leetcode.com/problems/top-k-frequent-elements/",
@@ -1306,6 +1316,11 @@
           "https://leetcode.com/problems/unique-paths/",
           "0062"
        ],
+       [
+         "Unique Paths II",
+         "https://leetcode.com/problems/unique-paths-ii/",
+         "0063"
+       ],
        [
           "Longest Common Subsequence",
           "https://leetcode.com/problems/longest-common-subsequence/",