add todo

Author: sinnbeck

README.md

@@ -1,5 +1,5 @@
 # HTML AST
-A HTML AST parser written in php. Inspired by the AST parser in TempestPHP (written by Brett Roose).
+An HTML AST (Abstract Syntax Tree) parser written in php. Inspired by the AST parser in TempestPHP (written by Brett Roose).
 
 It has a built-in lexer to parse the html, and then a AST parser to convert it into a tree structure.
 Finally, it comes with a printer to output properly formatted HTML (indented).
@@ -17,4 +17,9 @@ $nodeTree = $ast->parse();
 
 //and if you want to output the resulting HTML
 echo Printer::make()->render($html);
-```
+```
+
+## Todo
+* [ ] Add line numbers to lexer
+* [ ] Add html validator to ensure HTMl structure is valid
+* [ ] Add node visitors to allow changing HTML ?