chore(kb): start article about paperless-ngx

knowledge base/paperless-ngx.md

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+# Paperless-ngx
+
+Community-supported, open-source document management system that transforms physical documents into a searchable online
+archive.
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+
+## TL;DR
+
+TODO
+
+<!-- Uncomment if needed
+<details>
+  <summary>Installation and configuration</summary>
+</details>
+-->
+
+<!-- Uncomment if needed
+<details>
+  <summary>Usage</summary>
+</details>
+-->
+
+<!-- Uncomment if needed
+<details>
+  <summary>Real world use cases</summary>
+</details>
+-->
+
+## Further readings
+
+- [Website]
+
+<!--
+  References
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+<!-- Files -->
+<!-- Upstream -->
+[website]: https://docs.paperless-ngx.com/
+
+<!-- Others -->