add mine codes for leetcode.

Author: yangdi

src2/2Sum/2sum.py

@@ -0,0 +1,18 @@
+'''
+Given an array of integers, find two numbers such that they add up to a specific target number.
+
+The function twoSum should return indices of the two numbers such that they add up to the target, 
+
+where index1 must be less than index2. Please note that your returned answers (both index1 and index2) are not zero-based.
+
+You may assume that each input would have exactly one solution.
+
+Input: numbers={2, 7, 11, 15}, target=9
+Output: index1=1, index2=2
+'''
+
+
+class Solution:
+    # @return a tuple, (index1, index2)
+    def twoSum(self, num, target):
+