暂时实现了简陋的脚本AST分析解释，后面再绑定到控件上

Serein.Script/Node/BinaryOperationNode.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Script.Node
+{
+    /// <summary>
+    /// 二元表达式节点
+    /// </summary>
+
+    public class BinaryOperationNode : ASTNode
+    {
+        public ASTNode Left { get; }
+        public string Operator { get; }
+        public ASTNode Right { get; }
+
+        public BinaryOperationNode(ASTNode left, string op, ASTNode right)
+        {
+            Left = left;
+            Operator = op;
+            Right = right;
+        }
+    }
+}