Add translator source generator

PoyoLang.Translator.SourceGenerator/Node.cs

@@ -0,0 +1,15 @@
+namespace PoyoLang.Translator.SourceGenerator;
+
+public class Node
+{
+    public char Letter { get; }
+    public string Target { get; }
+
+    public List<Node> Nodes { get; } = [];
+
+    public Node(char letter, string target)
+    {
+        Letter = letter;
+        Target = target;
+    }
+}