Include more usage samples

Author: bsweeney

README.md

@@ -8,15 +8,14 @@ This library can be used to:
  * Extract advanced info (horizontal metrics, glyph names, glyph shapes, etc)
  * Make an Adobe Font Metrics (AFM) file from a font
 
-You can find a demo GUI [here](http://pxd.me/php-font-lib/www/font_explorer.html).
-
 This project was initiated by the need to read font files in the [DOMPDF project](https://github.com/dompdf/dompdf).
 
 Usage Example
 -------------
 
+### Base font information
 ```
-$font = \FontLib\Font::load('../../fontfile.ttf');
+$font = \FontLib\Font::load('fontfile.ttf');
 $font->parse();  // for getFontWeight() to work this call must be done first!
 echo $font->getFontName() .'<br>';
 echo $font->getFontSubfamily() .'<br>';
@@ -27,3 +26,21 @@ echo $font->getFontWeight() .'<br>';
 echo $font->getFontPostscriptName() .'<br>';
 $font->close();
 ```
+
+### Font Metrics Generation
+```
+$font = FontLib\Font::load('fontfile.ttf');
+$font->parse();
+$font->saveAdobeFontMetrics('fontfile.ufm');
+```
+
+### Create a font subset
+```
+$font = FontLib\Font::load('fontfile.ttf');
+$font->setSubset("abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ.:,;' (!?)+-*/== 1234567890"); // characters to include
+$font->reduce();
+touch('fontfile.subset.ttf');
+$font->open('fontfile.subset.ttf', FontLib\BinaryStream::modeReadWrite);
+$font->encode(array("OS/2"));
+$font->close();
+```