chore(kb): start article about flipper zero

knowledge base/flipper zero.md

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+# Flipper Zero
+
+Portable fully open-source and customizable multi-tool for pentesters and geeks in a toy-like body.
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+| Effect        | Hotkey                                                                                                                 | Notes                    |
+| ------------- | ---------------------------------------------------------------------------------------------------------------------- | ------------------------ |
+| Power on      | Press and hold `BACK` for 3 seconds                                                                                    |                          |
+| Reboot        | Press and hold `LEFT` and `BACK` for 5 seconds                                                                         |                          |
+| Hard reboot   | Press and hold `BACK` for 30 seconds                                                                                   | Resets the power circuit |
+| Recovery mode | Press and hold `LEFT` and `BACK` for 5 seconds<br/>Release `BACK` and keep holding `LEFT` until the blue LED lights up |                          |
+
+The device will **not** be able to work properly without a microSD card.<br/>
+The card of up to 256 GB is needed to store any data (e.g. keys, cards, remotes, databases). A 4 GB one should be
+sufficient to store all the necessary data.<br/>
+The Flipper Zero may take longer to recognize a microSD card with a higher storage capacity.<br/>
+The device uses a slow, energy-efficient SPI interface that can read data at almost 600 KiB/s, which is sufficient for
+it's tasks.
+
+Update the device via the _Flipper Mobile_ app or _qFlipper_.
+
+<details>
+  <summary>Setup</summary>
+
+```sh
+curl -o 'qFlipper.AppImage' 'https://update.flipperzero.one/builds/qFlipper/1.3.3/qFlipper-x86_64-1.3.3.AppImage'
+sudo './qFlipper.AppImage' rules install
+```
+
+</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]
+
+### Sources
+
+- [Documentation]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+<!-- Files -->
+<!-- Upstream -->
+[codebase]: https://github.com/flipperdevices
+[documentation]: https://docs.flipper.net/
+[website]: https://flipperzero.one/
+
+<!-- Others -->