Add tutorial for using the comunica packager

pages/docs/2_modify/1_getting_started/7_custom_init_packager.md

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+---
+title: 'Exposing your custom config as an npm package using Comunica Packager'
+description: 'Wrap your config in an npm package, and expose a CLI tool and a JavaScript API using the simple Comunica
+Packager application.'
+---
+
+In this guide, we will yet again wrap our custom config into a new npm package but this time we will be using the
+Comunica Packager.
+
+The difference here is that the application will do most of the work for us. This includes the `package.json`,
+the CLI tools, the JavaScript API and finally the structure of the engine configuration.
+
+## 1. Open the application and select the Comunica SPARQL preset
+
+Open the application [here](https://comunica.github.io/comunica-packager/) and click on `Import config`. When the
+dropdown opens, click on `Comunica SPARQL`.
+
+<img src="/img/select_preset.png" alt="select preset" width="750"/>
+
+## 2. Select the correct set and delete the unnecessary actors
+
+On the left, select the set `sparql-queryoperators` in the `Sets` section. Wait until everything is loaded if necessary
+and scroll until you see the actors of type `ActorQueryOperationConstruct` and `ActorQueryOperationDescribeSubject` if
+they are not on the screen.
+
+<img src="/img/click_sparql_queryoperators.png" alt="select preset" width="750"/>
+
+Delete each actor respectively by clicking on the close button on the top right of each
+actor and subsequently clicking on confirm.
+
+<img src="/img/confirm_delete.png" alt="select preset" width="750"/>
+
+## 3. Export configuration and optionally fill in package information
+
+Now, you are ready to export this configuration. After pressing the `Export config` button in the top bar, a screen will
+pop up where you can optionally fill in package information such as the package name and the author. Whenever you're
+ready to finish you can press the `Export` button on the pop up screen to download a zip file containing all the
+necessary files for this configuration.
+
+
+<img src="/img/export_config.png" alt="select preset" width="750"/>