add csharp version to the exercice

csharp/TheatricalPlayersRefactoringKata/Play.cs

@@ -0,0 +1,16 @@
+namespace TheatricalPlayersRefactoringKata
+{
+    public class Play
+    {
+        private string _name;
+        private string _type;
+
+        public string Name { get => _name; set => _name = value; }
+        public string Type { get => _type; set => _type = value; }
+
+        public Play(string name, string type) {
+            this._name = name;
+            this._type = type;
+        }
+    }
+}