Update README

@@ -3,3 +3,5 @@
 This set of plugin allows Flutter apps to generate and print pdf files to device printer. 
 This plugin works for iOS and Android.
 
+* dart pdf: <https://pub.dartlang.org/packages/pdf>
+* flutter printing: <https://pub.dartlang.org/packages/printing>

 # 1.0.4
 * Updated homepage
 * Update source formatting
+* Update README
 
 # 1.0.3
 * Remove dependency to ttf_parser

@@ -4,6 +4,9 @@ This is a low-level Pdf creation library.
 It can create a full multi-pages document with graphics,
 images and text using TrueType fonts.
 
+> Use `printing` package <https://pub.dartlang.org/packages/printing>
+> for full flutter print and share operation.
+
 The coordinate system is using the internal Pdf system:
  * (0.0, 0.0) is bottom-left
  * 1.0 is defined as 1 / 72.0 inch
@@ -27,7 +30,7 @@ var file = new File('file.pdf');
 file.writeAsBytesSync(pdf.save());
 ```
 
-To load an image it is possible to use the dart library `image`
+To load an image it is possible to use the dart library [image](https://pub.dartlang.org/packages/image):
 
 ```dart
 Image image = decodeImage(new Io.File('test.webp').readAsBytesSync());

 # 1.0.3
 * Update source formatting
+* Update README
 
 # 1.0.2
 * Add License file

 # Printing
 
-Plugin that allows Flutter apps to generate and print documents to android or ios compatible printers
+Plugin that allows Flutter apps to generate and print
+documents to android or ios compatible printers
 
-## Getting Started
+See the example on how to use the plugin.
 
-For help getting started with Flutter, view our online
-[documentation](https://flutter.io/).
+> This plugin uses the `pdf` package <https://pub.dartlang.org/packages/pdf>
+> for pdf creation. Please refer to <https://pub.dartlang.org/documentation/pdf/latest/>
+> for documentation.
 
-For help on editing plugin code, view the [documentation](https://flutter.io/developing-packages/#edit-plugin-package).
+To load an image it is possible to use
+[Image.toByteData](https://docs.flutter.io/flutter/dart-ui/Image/toByteData.html):
+
+```dart
+var Image im;
+var bytes = await im.toByteData(format: ui.ImageByteFormat.rawRgba);
+
+PDFImage image = PDFImage(
+    pdf,
+    image: bytes.buffer.asUint8List(), 
+    width: im.width, 
+    height: im.height);
+g.drawImage(image, 100.0, 100.0, 80.0);
+```
+
+To use a TrueType font from a flutter bundle:
+
+```dart
+var font = await rootBundle.load("assets/open-sans.ttf");
+PDFTTFFont ttf = new PDFTTFFont(pdf, font);
+g.setColor(new PDFColor(0.3, 0.3, 0.3));
+g.drawString(ttf, 20.0, "Dart is awesome", 50.0, 30.0);
+```