Add code for Khadane algorithm

python/khadane.py

@@ -0,0 +1,21 @@
+# defining the function to find the maximum subarray sum  
+def max_Subarray_Sum(my_array, array_size):  
+    # assigning the variables  
+    maxTillNow = my_array[0]  
+    maxEnding = 0  
+
+    # using the for-loop  
+    for n in range(0, array_size):  
+        maxEnding = maxEnding + my_array[n]  
+        # using the if-elif-else statement  
+        if maxEnding < 0:  
+            maxEnding = 0  
+
+        elif (maxTillNow < maxEnding):  
+            maxTillNow = maxEnding  
+
+    return maxTillNow  
+# defining the array  
+my_array = [-2, -3, 4, -1, -2, 5, -3]  
+# printing the maximum subarray sum for the users  
+print("Maximum Subarray Sum:", max_Subarray_Sum(my_array, len(my_array)))