updated readme for better usage description

Author: Marvin Kuhn

README.md

@@ -1,27 +1,67 @@
-# NEOS error pages
-[![Latest Stable Version](https://poser.pugx.org/breadlesscode/neos-error-pages/v/stable)]()
-[![Downloads](https://img.shields.io/packagist/dt/breadlesscode/neos-error-pages.svg)]()
-[![license](https://img.shields.io/github/license/breadlesscode/neos-error-pages.svg)]()
+# Neos error pages
 
-This package provides multible error pages for your NEOS CMS site.
-You can have a error page for each sub folder, this package shows the nearest error page.
+[![Latest Stable Version](https://poser.pugx.org/breadlesscode/neos-error-pages/v/stable)](https://packagist.org/packages/breadlesscode/neos-error-pages)
+[![Downloads](https://img.shields.io/packagist/dt/breadlesscode/neos-error-pages.svg)](https://packagist.org/packages/breadlesscode/neos-error-pages)
+[![License](https://img.shields.io/github/license/breadlesscode/neos-error-pages.svg)](LICENSE)
+[![GitHub stars](https://img.shields.io/github/stars/breadlesscode/neos-error-pages.svg?style=social&label=Stars)](https://github.com/breadlesscode/neos-error-pages/stargazers)
+[![GitHub watchers](https://img.shields.io/github/watchers/breadlesscode/neos-error-pages.svg?style=social&label=Watch)](https://github.com/breadlesscode/neos-error-pages/subscription)
+
+This package provides multiple error pages for your Neos CMS site.
+You can add an error page for each subfolder; this package shows the nearest
+error page from the entry point.
 
 ## Installation
-Install this package in your NEOS project root.
 
+Most of the time you have to make small adjustments to a package (e.g., the
+configuration in `Settings.yaml`). Because of that, it is important to add the
+corresponding package to the composer from your theme package. Mostly this is the
+site package located under `Packages/Sites/`. To install it correctly go to your
+theme package (e.g.`Packages/Sites/Foo.Bar`) and run following command:
+
+```bash
+composer require breadlesscode/neos-error-pages --no-update
 ```
-composer require breadlesscode/neos-error-pages
-```
-Nearly zero configuration!
+
+The `--no-update` command prevent the automatic update of the dependencies.
+After the package was added to your theme `composer.json`, go back to the root
+of the Neos installation and run `composer update`. Your desired package is now
+installed correctly.
 
 ## Usage
 
-1. Create your error page in your dimension.
-2. Select the correct status codes in the NEOS inspector.
-3. Publish
+1. Configure the node type
+2. Configure the fusion prototype
+3. Add one error page to your site root
 
-## Todo
-- [ ] Write some tests (as always...)
+### `Breadlesscode.ErrorPages:Page`
+
+The node type `Breadlesscode.ErrorPages:Page`does inherit from `Neos.Neos:Document`.
+There are no child nodes defined, so if you want to add content elements to your
+error page, you have to add a ContentCollection to the node type.
+
+```
+'Breadlesscode.ErrorPages:Page':
+  childNodes:
+    main:
+      type: 'Neos.Neos:ContentCollection'
+```
+
+To overwrite the document with your custom document you can do it like this:
+
+```fusion
+prototype(Breadlesscode.ErrorPages:Page) >
+prototype(Breadlesscode.ErrorPages:Page) < prototype(Vendor.Foo:Page.Document)
+```
+
+### Fusion path
+
+`errorPages` is the fusion path which gets rendered if an error page gets shown.
+Make sure it has the same look as when you go directly to the page.
 
 ## License
-The MIT License (MIT). Please see [License File](LICENSE) for more information.
+
+The MIT License (MIT). Please see [License File](LICENSE) for more information.
+
+## Contributors
+ - [Breadlesscode](https://github.com/breadlesscode)
+ - [Jonnitto](https://github.com/jonnitto)