Begin documenting supported (target) platforms

docs/reference/index.rst

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    :caption: Introduction
 
    src/introduction/index.rst
+   src/introduction/supported_platforms.md
 
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docs/reference/src/introduction/supported_platforms.md

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+# Supported Platforms
+
+Slint runs on many desktop and embedded platforms and micro-controllers.
+
+The platform descriptions below cover what has been tested for deployment. For the development environment,
+we recommend using a recent desktop operating system and a recent compiler.
+
+Please contact [SixtyFPS GmbH](https://slint.dev/contact) if you need to support specific, older versions.
+
+## Desktop Platforms
+
+Generally, Slint runs on Windows, macOS, and popular Linux distributions. The following tables below
+cover versions that we specifically test. The general objective is to support the operating systems that
+are supported by their vendors by the time a Slint version is released.
+
+### Windows
+
+| Operating System | Architecture |
+|------------------|--------------|
+| Windows 10       | x86-64       |
+| Windows 11       | x86-64       |
+
+### macOS
+
+| Operating System  | Architecture    |
+|-------------------|-----------------|
+| macOS 11 Big Sur  | x86-64, aarch64 |
+| macOS 12 Monterey | x86-64, aarch64 |
+| macOS 13 Ventura  | x86-64, aarch64 |
+
+### Linux
+
+Linux desktop distribution present a diverse landscape, and Slint should run on any of them, provided that they
+are using Wayland or X-Windows, glibc, and d-bus. If a Linux distribution provides Long Term Support (LTS),
+Slint should run on the most recent LTS or newer, by the time a Slint version is released.
+
+## Embedded Platforms
+
+Slint runs on a great variety of embedded platforms. Generally speaking, Slint requires a modern Linux userspace
+with working OpenGL ES 2.0 (or newer) or Vulkan drivers. We've had success running Slint on
+
+ - Yocto based distributions. For C++ applications see [meta-slint](https://github.com/slint-ui/meta-slint) for recipes. Rust application work out of the box with Yocto's rust support.
+ - BuildRoot based distributions.
+ - [TorizonCore](https://www.torizon.io/torizoncore-os).
+
+### Microcontrollers
+
+Slint's platform abstraction allows for integration into any Rust or C++ based Microcontroller development
+environment. Developers need to implement functionality to feed input events such as touch or keyboard, as
+well as displaying the pixels rendered by Slint into a frame- or linebuffer.