docs: add one-command universal installer for Linux, macOS and Windows

README.md

@@ -19,6 +19,7 @@
   - [Signal K Platform](#signal-k-platform)
   - [Documentation, Community \& Support](#documentation-community--support)
   - [How to get Signal K Server?](#how-to-get-signal-k-server)
+    - [Install with one command](#install-with-one-command)
   - [Configuration and use](#configuration-and-use)
     - [Opening the Signal K Server Admin UI](#opening-the-signal-k-server-admin-ui)
     - [Creating an admin account](#creating-an-admin-account)
@@ -80,6 +81,16 @@ There is a [Signal K Server FAQ Frequently Asked Questions](https://github.com/S
 
 ## How to get Signal K Server?
 
+### Install with one command
+
+The [Signal K Universal Installer](https://github.com/dirkwa/signalk-universal-installer) installs and runs Signal K Server as a container stack on Linux, macOS and Windows 11, on amd64 and arm64. On Linux:
+
+```shell
+curl -fsSL https://dirkwa.github.io/signalk-universal-installer/installer/linux/install.sh | bash
+```
+
+See the installer's [quick start](https://github.com/dirkwa/signalk-universal-installer#quick-start) for the macOS and Windows commands, along with the supported operating system versions and prerequisites. On Windows it runs the stack in a Podman machine on WSL2, which is a different approach from the [signalk-server-windows](https://github.com/SignalK/signalk-server-windows) installer listed below. It also installs an updater for switching and rolling back server images, a doctor for health checks, recovery and bug reports, and a `signalk` command line tool.
+
 For the typical boater, not being a software developer nor electrical engineer, the best option is to get a (commercially available) product that already has Signal K Server inside. These are the currently available devices:
 
 - [HALPI2](https://shop.hatlabs.fi/products/halpi2-computer) by Hat Labs, a Raspberry Pi Compute Module 5 boat computer with Signal K Server preconfigured