Updated the README documentation

Author: waltertamboer

README.md

@@ -16,19 +16,55 @@ composer require chesszebra/portable-game-notation
 
 ### Reading
 
+#### From a string
+
 Reading a single PGN game from a string:
 
 ```php
-use ChessZebra\PortableGameNotation\Parser\Parser;
-use ChessZebra\PortableGameNotation\Lexer\StreamLexer;
+use ChessZebra\PortableGameNotation\Reader\StringReader;
+
+$reader = new StringReader('1. e4 e5');
+
+$tokenIterator = $reader->read();
+```
+
+#### From a stream
 
-$parser = new Parser(new StreamLexer(fopen('games.pgn', 'r')));
+Reading a single PGN game from a stream:
 
-$tokenIterator = $parser->parse();
+```php
+use ChessZebra\PortableGameNotation\Reader\StringReader;
+
+$reader = new StreamReader(fopen('games.pgn', 'r'));
+
+$tokenIterator = $reader->read();
 ```
 
 ### Writing
 
+#### To a string
+
+Wriring a PGN game to a string:
+
+```php
+use ChessZebra\PortableGameNotation\TokenIterator;
+use ChessZebra\PortableGameNotation\Token\StandardAlgebraicNotation;
+use ChessZebra\PortableGameNotation\Writer\StringWriter;
+use ChessZebra\StandardAlgebraicNotation\Notation;
+
+$tokenIterator = new TokenIterator([
+    new MoveNumber(1),
+    new StandardAlgebraicNotation(new Notation('e4')),
+]);
+
+$writer = new StringWriter();
+$writer->write($tokenIterator);
+
+$pgn = $writer->getPgn();
+```
+
+#### To a stream
+
 Wriring a PGN game to a stream:
 
 ```php

tests/Writer/StringTest.php renamed to tests/Writer/StringWriterTest.php

@@ -13,7 +13,7 @@
 use ChessZebra\PortableGameNotation\Token\TokenIterator;
 use PHPUnit\Framework\TestCase;
 
-final class StringTest extends TestCase
+final class StringWriterTest extends TestCase
 {
     public function testIfDataIsPopulated()
     {