Update solution 001 Solution.js

Author: Mcnwork2018

solution/001.Two Sum/README.md

@@ -29,4 +29,4 @@ class Solution {
         return null;
     }
 }
-```
+```

solution/001.Two Sum/Solution.js

@@ -0,0 +1,10 @@
+var twoSum = function(nums, target) {
+    var len = nums.length;
+    var n = {};
+    for(var i = 0; i < len; i++){
+        if(n[target - nums[i]] !== undefined){
+            return [n[target - nums[i]], i];
+        }
+        n[nums[i]] = i;
+    }
+};