Added Parser

- can parse a basic token list to an AST

Compiler/Parser/Nodes/Node.cs

@@ -0,0 +1,15 @@
+using System.Collections.Generic;
+
+namespace Compiler.Parser.Nodes
+{
+    public abstract class Node
+    {
+        public abstract NodeType NodeType { get; set; }
+        public List<Node> Children { get; set; }
+
+        protected Node()
+        {
+            Children = new List<Node>();
+        }
+    }
+}