chore(kb): start mullvad vpn's article

knowledge base/mullvad vpn.md

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+# Mullvad VPN
+
+> TODO
+
+Intro
+
+<!-- Remove this line to uncomment if used
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+One can use the same Mullvad VPN account on up to 5 different devices.<br/>
+When logging in with accounts that already have 5 devices associated with it, the application will show a list of
+devices and prompt to log out of at least one of them.
+
+<!-- Uncomment if used
+<details>
+  <summary>Setup</summary>
+
+```sh
+```
+
+</details>
+-->
+
+<!-- Uncomment if used
+<details>
+  <summary>Usage</summary>
+
+```sh
+```
+
+</details>
+-->
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+
+```sh
+```
+
+</details>
+-->
+
+## Further readings
+
+- [Website]
+- [Codebase]
+- [Documentation]
+- [Blog]
+
+### Sources
+
+- [Documentation / Using the Mullvad VPN app]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+<!-- Files -->
+<!-- Upstream -->
+[Blog]: https://mullvad.net/en/blog
+[Codebase]: https://github.com/mullvad/
+[Documentation]: https://mullvad.net/en/help/
+[Documentation / Using the Mullvad VPN app]: https://mullvad.net/en/help/using-mullvad-vpn-app
+[Website]: https://mullvad.net/en/
+
+<!-- Others -->