add Two Sum task

Two Sum/solution.py

@@ -0,0 +1,10 @@
+class Solution:
+    def twoSum(self, nums: List[int], target: int) -> List[int]:
+        d: dict = {}
+
+        for i in range(len(nums)):
+            if (target - nums[i]) in d.keys():
+                return [i, d[target - nums[i]]]
+            else:
+                d[nums[i]] = i
+