Added odd_sum and smooth_max solutions

Added odd_sum and smooth_max solutions that I created

Author: Citrus716

2_intermediate/chapter10/solutions/odd_sum.py

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+# Odd Sum
+# Given a 2D list, find the sum of all elements at odd indexes for all
+# the lists at odd indexes. Print this sum times the sum of all
+# first element of all the 1D lists in the 2D list.
+#
+# Ex:[[1,2,3,6],[2,41,2,1]]should have print 42 after the program runs.
+#
+# Write the code below.
+
+two_d_list = [[1,2,3,5,2],[2,3,1,4],[2,3,1,2,21],[21,3,1,41]]
+#two_d_list should print 51 after the program runs.

2_intermediate/chapter10/solutions/smooth_max.py

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+# Given a 2D list, let's call a element "smooth" if index of the
+# element in its 1D list plus the element is even. For example,
+# given the 2D list [[0,4][2,6]], the 1st element of each of the
+# 1D list is considered "smooth" because 0 + 0 is 0 and 0 + 2 is 2
+# (both are even numbers). Find the maximum "smooth" element and
+# print it. Using the example [[0,4][2,6]] again, the maximum 
+# "smooth" element is 2 because 2 is bigger than 0.
+
+two_d_list = [[425,214,412,123],[312,214,123,343]]
+