Add example to README

README.md

@@ -3,11 +3,14 @@
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+[![Minimum PHP Version](https://img.shields.io/badge/php-%3E%3D%207.4-8892BF.svg?style=flat-square)](https://php.net/)
 
-EDIFACT stands for Electronic Data Interchange For Administration, Commerce, and Transport. 
+EDIFACT stands for `Electronic Data Interchange For Administration, Commerce, and Transport`. 
 
 This repository contains a parser for any EDIFACT file to extract the values from any segment
-defined in an EDIFACT formatted file. [What is EDIFACT?](/docu/what-is-edifact.md)
+defined in an EDIFACT formatted file. 
+
+Ok, but... [What is EDIFACT?](/docu/what-is-edifact.md)
 
 ## Format of an EDIFACT file
 
@@ -16,3 +19,45 @@ defined in an EDIFACT formatted file. [What is EDIFACT?](/docu/what-is-edifact.m
 Following the rest of the data that belongs to that segment. See more about segments [here](/docu/segments.md).
 * A message is a list of segments. Usually, all segments between the UNH and UNT segments compound a message.
 * A transaction is the list of messages that belongs to a file. 
+
+## Installation as vendor
+
+Using composer: ```composer require chemaclass/edifact-parser```
+
+## Development and contribution
+
+### Your first try!
+
+1. Clone/Fork the project and `cd` inside the repository
+2. `docker-compose up`
+3. `make bash` or `docker exec -ti -u dev edifact_parser_php bash` 
+4. `composer install`
+5. `php example.php`
+
+## Basic example
+
+You can see a full example of usage [here](example.php).
+
+```php
+<?php declare(strict_types=1);
+
+require dirname(__DIR__) . '/vendor/autoload.php';
+
+use EdifactParser\EdifactParser;
+
+$fileContent = <<<EDI
+UNA:+.? '
+UNB+UNOC:3+9457386:30+73130012:30+19101:118+8+MPM 2.19+1424'
+UNH+1+IFTMIN:S:93A:UN:PN001'
+TDT+20'
+NAD+CZ+0410106314:160:Z12++Company Centre+c/o Carrier AB+City1++12345+DE'
+NAD+CN+++Person Name+Street Nr 2+City2++12345+DE'
+... etc
+UNT+18+1'
+UNZ+2+8'
+EDI;
+
+/** @psalm-var list<TransactionMessage> $messages */
+$messages = EdifactParser::create()->parse($fileContent);
+```
+