added new exo

Algorithms/IntChainLink.cs

@@ -0,0 +1,29 @@
+namespace Algorithms;
+
+public class IntChainLink
+{
+    private int value;
+    private IntChainLink? lst;
+
+    public IntChainLink(int value)
+    {
+        this.value = value;
+        this.lst = null;
+    }
+
+    public IntChainLink(int value, IntChainLink lst)
+    {
+        this.value = value;
+        this.lst = lst;
+    }
+
+    public int Head()
+    {
+        return value;
+    }
+
+    public IntChainLink Rest()
+    {
+        return lst!;
+    }
+}