Add multilingual language and systems learning tracks

ceb/csharp-practice-20261101/lesson-2/main.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+class Program {
+    class Plan { public int Done = 2; }
+    static void Main() {
+        var plan = new Plan();
+        var alias = plan;
+        alias.Done = 3;
+        Console.WriteLine(plan.Done);
+    }
+}