bracket system

src/DataStructure/Tree/Tree.cs

@@ -0,0 +1,11 @@
+namespace Skeleton.DataStructure.Tree;
+
+public class Tree<T>
+{
+    public Tree(T root)
+    {
+        Root = new TreeNode<T>(root);
+    }
+
+    public TreeNode<T> Root { get; set; }
+}

src/DataStructure/Tree/TreeNode.cs

@@ -0,0 +1,19 @@
+namespace Skeleton.DataStructure.Tree;
+
+public class TreeNode<T>
+{
+    public static TreeNode<T> Null = null;
+    public TreeNode(T obj)
+    {
+        Value = obj;
+        Children = new();
+    }
+
+    public T Value { get; set; }
+    public HashSet<TreeNode<T>> Children { get; set; }
+
+    public void AddChild(T child)
+    {
+        Children.Add(new TreeNode<T>(child));
+    }
+}