Initial data commit

Task/Parametric-polymorphism/C-sharp/parametric-polymorphism-1.cs

@@ -0,0 +1,27 @@
+using System;
+
+class BinaryTree<T>
+{
+    public T value;
+    public BinaryTree<T> left;
+    public BinaryTree<T> right;
+
+    public BinaryTree(T value)
+    {
+        this.value = value;
+    }
+
+    public BinaryTree<U> Map<U>(Func<T, U> f)
+    {
+        BinaryTree<U> tree = new BinaryTree<U>(f(this.value));
+        if (this.left != null)
+        {
+            tree.left = this.left.Map(f);
+        }
+        if (this.right != null)
+        {
+            tree.right = this.right.Map(f);
+        }
+        return tree;
+    }
+}