Add project files.

TrackerLibrary/MatchupModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace TrackerLibrary
+{
+    /// <summary>
+    /// Represents one match in the tournament.
+    /// </summary>
+    public class MatchupModel
+    {
+        /// <summary>
+        /// The set of teams that were involved in this match.
+        /// </summary>
+        public List<MatchupEntryModel> Entries { get; set; } = new List<MatchupEntryModel>();
+        /// <summary>
+        /// The winner of the match.
+        /// </summary>
+        public TeamModel Winner { get; set; }
+        /// <summary>
+        /// Which round this match is a part of.
+        /// </summary>
+        public int MatchupRound { get; set; }
+    }
+}