Add Player class and some UT to provoke CI

Sources/Model/Player.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace Model
+{
+    public class Player
+    {
+        private readonly string _name;
+        public Player(string name)
+        {
+            _name = name;
+        }
+        public string Name => _name;
+    }
+}

Sources/Tests/PlayerTest.cs

@@ -0,0 +1,16 @@
+using Model;
+using System;
+using Xunit;
+
+namespace Tests
+{
+    public class PlayerTest
+    {
+        [Fact]
+        public void TestConstructor()
+        {
+            Player player = new Player("Alice");
+            Assert.Equal("Alice", player.Name);
+        }
+    }
+}