Added solution to problem 31

Problem31.m

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+function [] = Problem31()
+%ProjectEuler/Octave/Problem31.m
+%Matthew Ellison
+% Created: 06-19-20
+%Modified: 06-19-20
+%How many different ways can £2 be made using any number of coins?
+%{
+	Copyright (C) 2020  Matthew Ellison
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program.  If not, see <https://www.gnu.org/licenses/>.
+%}
+
+
+%Setup the variables
+desiredValue = 200;
+permutations = 0;
+
+%Start the timer
+startTime = clock();
+
+%Start with 200p and remove the necessary coins with each loop
+pound2 = desiredValue;
+while(pound2 >= 0)
+	pound1 = pound2;
+	while(pound1 >= 0)
+		pence50 = pound1;
+		while(pence50 >= 0)
+			pence20 = pence50;
+			while(pence20 >= 0)
+				pence10 = pence20;
+				while(pence10 >= 0)
+					pence5 = pence10;
+					while(pence5 >= 0)
+						pence2 = pence5;
+						while(pence2 >= 0)
+							permutations += 1;
+							pence2 -= 2;
+						end
+						pence5 -= 5;
+					end
+					pence10 -= 10;
+				end
+				pence20 -= 20;
+			end
+			pence50 -= 50;
+		end
+		pound1 -= 100;
+	end
+	pound2 -= 200;
+end
+
+%Stop the timer
+endTime = clock();
+
+%Print the results
+printf("There are %d ways to make 2 pounds with the given denominations of coins\n", permutations);
+printf("It took %f seconds to run this algorithm\n", etime(endTime, startTime))
+
+%{
+Results:
+There are 73682 ways to make 2 pounds with the given denominations of coins
+It took 0.122734 seconds to run this algorithm
+%}