README.md Güncelle

README.md

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 # LeetCode-1.Two_Sum_via_CPP
 
+## Problem Statement - Two Sum
+Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.
+You may assume that each input would have exactly one solution, and you may not use the same element twice.
+You can return the answer in any order.
+
+## Example 1:
+Input: nums = [2,7,11,15], target = 9
+Output: [0,1]
+Explanation: Because nums[0] + nums[1] == 9, we return [0, 1].
+
+## Example 2:
+Input: nums = [3,2,4], target = 6
+Output: [1,2]
+
+## Example 3:
+Input: nums = [3,3], target = 6
+Output: [0,1]
+
+## Constraints:
+2 <= nums.length <= 104
+-109 <= nums[i] <= 109
+-109 <= target <= 109
+Only one valid answer exists.