Add project files.

BrokerageLib/CommissionConstants.cs

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+namespace BrokerageLib {
+
+	public class Constants {
+
+		public class CommissionRate {
+			public const decimal Standard = 0.08m;
+			public const decimal Earner = 0.11m;
+			public const decimal Top = 0.14m;
+		}
+
+		public class Discount {
+			public const decimal PreferredCustomer = 0.2m;
+			public const decimal BulkOrder = 0.5m;
+		}
+
+		public class CommissionThreshold {
+			public const decimal SalesAmount = 12000m;
+			public const decimal UnitAmount = 400m;
+		}
+	}
+}