chore(kb): start zen browser's article

knowledge base/zen browser.md

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+# Zen browser
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+<details>
+  <summary>Setup</summary>
+
+```sh
+brew install --cask 'zen-browser'
+```
+
+</details>
+
+Split tabs by:
+
+1. Selecting desired ones:
+   - Hold `CTRL` or `CMD`, then left-click to select only specific tabs, or
+   - Left-click 2 tabs while holding the Shift key to select all tabs in between.
+1. Right click one of the selected tabs.
+1. Choose the _Split x Tabs_ contextual menu option.
+   X will be the number of selected tabs.
+
+The default Split View layout is a grid. Change it by pressing the 🔗 button in the top address bar (usually between the
+tab container indicator and the favourites' star button).
+
+## Further readings
+
+- [Website]
+- [Main repository]
+- [Documentation]
+
+### Sources
+
+- [How do I use the Split View feature?]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- Upstream -->
+[documentation]: https://docs.zen-browser.app/
+[how do i use the split view feature?]: https://docs.zen-browser.app/faq#how-do-i-use-the-split-view-feature
+[main repository]: https://github.com/zen-browser/desktop
+[website]: https://zen-browser.app/