feat: finish two sum in python

Author: bujosa

alternative/easy/two_sum.py

@@ -0,0 +1,17 @@
+def two_sum(nums, target):
+    map = {}
+
+    for i, num in enumerate(nums):
+        complement = target - num
+
+        if complement in map:
+            return [map[complement], i]
+
+        map[num] = i
+
+    return []
+
+# Test cases
+assert two_sum([2, 7, 11, 15], 9) == [0, 1]
+assert two_sum([3, 2, 4], 6) == [1, 2]
+assert two_sum([3, 3], 6) == [0, 1]