FIX: ci.yml, DemoApplication.cs

DemoApplication.cs

@@ -1,4 +1,13 @@
-void main(){
-    System.out.println(new Date());
-    System.out.println("Hello world");
+using System;
+
+namespace Lab2
+{
+    public class DemoApplication
+    {
+        public static void Main(string[] args)
+        {
+            Console.WriteLine(DateTime.Now);
+            Console.WriteLine("Hello world");
+        }
+    }
 }