Update README.md

Author: casperbakker

README.md

@@ -1,6 +1,8 @@
 # Picqer Extended Integration for Shopware 6
 Shopware extension for Picqer
 
+[Read full documentation on picqer.com](https://picqer.com/nl/help/artikelen/shopware-6-plugin)
+
 ## Installation
 This project can easily be installed through Composer.
 
@@ -21,4 +23,4 @@ Orders will now be pushed to Picqer immediately.
 1. Log onto your Shopware Administration portal and navigate to Extensions > My extensions.
 2. Uninstall the Picqer plugin.
 3. ``` composer remove picqer/shopware-plugin ```
-4. Remove the Picqer plugin. 
+4. Remove the Picqer plugin.