Add solution for leetcode longestConsecutive

Author: wisdom08

longest-consecutive-sequence/wisdom08.py

@@ -0,0 +1,10 @@
+def longestConsecutive(nums):
+    longest = 0
+
+    for num in nums:
+        length = 1
+        while num + length in nums:
+            length += 1
+        longest = max(longest, length)
+
+    return longest