Added readme

CHANGELOG.md

 ## [0.9.0]
 
-* Initial release.
+* Initial release
 * Added basic functions (cut paper, write line, ...)
 * Text styling (bold, underline, reverted, ...)
 * Text align
-* Table row printing (up to 12 columns)
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+* Table row printing (up to 12 columns of different width)
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README.md

 # esc_pos_printer
 
-A new Flutter package project.
+The library allows to print receipts using a ESC/POS (usually thermal) network printer.
+
+It can be used in [Flutter](https://flutter.dev/) or [Dart](https://dart.dev/) projects. In Flutter, both Android and iOS are supported.
+
+## Features
+
+* Connect to Wi-Fi printers
+* Simple text printing using *println* method
+* Tables printing using *printRow* method
+* Text styling:
+  * size, align, bold, reverse, underline, different fonts
+* Paper cut (partial, full)
+* Beeping (with different duration)
+* Paper feed, reverse feed
+
+**Note**: Your printer may not support some of the presented features (especially for underline styles, partial/full paper cutting, reverse feed, ...).
 
 ## Getting Started
 
-This project is a starting point for a Dart
-[package](https://flutter.dev/developing-packages/),
-a library module containing code that can be shared easily across
-multiple Flutter or Dart projects.
+```dart
+import 'package:esc_pos_printer/esc_pos_printer.dart';
+
+Printer.connect('192.168.0.123').then((printer) {
+    printer.println(PosString('Normal text'));
+    printer.println(PosString('Bold text', bold: true));
+    printer.println(PosString('Reverse text', reverse: true));
+    printer.println(PosString('Underlined text', underline: true));
+    printer.println(PosString('Align center', align: PosTextAlign.center));
+    printer.printRow([3, 6, 3],
+      [
+        PosString('col3'),
+        PosString('col6'),
+        PosString('col3', underline: true)
+      ],
+    );
+    printer.println(PosString('Text size 200%',
+        height: PosTextSize.size2, width: PosTextSize.size2));
+
+    printer.cut();
+    printer.disconnect();
+  });
+```
 
-For help getting started with Flutter, view our 
-[online documentation](https://flutter.dev/docs), which offers tutorials, 
-samples, guidance on mobile development, and a full API reference.
+## TODO
+* Add raw print function
+* Print images
+* Print barcodes
+* Print QR codes
+* Example project for Flutter (print a receipt template)
+* Turn 90° clockwise rotation mode on/off
+* Discover active Wi-Fi printers
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example/example.dart

 import 'package:esc_pos_printer/esc_pos_printer.dart';
-import 'package:esc_pos_printer/src/printer.dart';
 
 void main() {
   Printer.connect('192.168.0.123').then((printer) {