chore(kb): add cpu architecture cheat sheet

knowledge base/cpu architectures.md

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+# CPU architectures
+
+> 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
+
+| Architecture                         | Summary                                                    |
+| ------------------------------------ | ---------------------------------------------------------- |
+| `arm`, `AArch32`, `ARMv1` … `ARMv7`  | 32-bit ARM CPUs                                            |
+| `arm64`, `AArch64`, `ARMv8`, `ARMv9` | 64-bit ARM CPUs                                            |
+| `i386` … `i586`                      | 32-bit AMD or Intel CPUs                                   |
+| `ppc64le`                            | 64-bit PowerPC CPUs with **little-endian** memory ordering |
+| `rv64gc`, `rv64g`                    | 64-bit RISC-V CPUs                                         |
+| `x86_64`, `amd64`                    | 64-bit AMD or Intel CPUs                                   |
+| `x86`                                | Generic AMD or Intel CPUs                                  |
+
+<!-- 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
+
+### Sources
+
+- [`arm` vs `aarch64` vs `amd64` vs `x86_64` vs `x86`: What's the Difference?][arm vs aarch64 vs amd64 vs x86_64 vs x86: what's the difference?]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+<!-- Files -->
+<!-- Upstream -->
+[arm vs aarch64 vs amd64 vs x86_64 vs x86: What's the Difference?]: https://itsfoss.com/arm-aarch64-x86_64/
+
+<!-- Others -->