Added python solution for 2sum problem

Author: venkat-siddarth

twoSumusingHashMap.py

@@ -0,0 +1,19 @@
+
+'''The below approach is using Hash data structure where we store only the unique values of the array
+This approach can be extended to 3sum problem as well
+'''
+def printPairs(arr, arr_size, sum):
+	hashmap = {}
+
+	for i in range(0, arr_size):
+		temp = sum-arr[i]
+		if (temp in hashmap):
+			print('Yes')
+			return
+		hashmap[arr[i]] = i
+	print("No")
+
+
+A = [1, 4, 45, 6, 10, 8]
+n = 16
+printPairs(A, len(A), n)