Add rpi5 notice to the README

README.md

@@ -82,6 +82,7 @@ community.
 | **[NervesSystemRPi3](https://github.com/nerves-project/nerves_system_rpi3)** | Base Nerves system configuration for the Raspberry Pi 3 | [![Hex.pm](https://img.shields.io/hexpm/v/nerves_system_rpi3.svg)](https://hex.pm/packages/nerves_system_rpi3) |
 | **[NervesSystemRPi3A](https://github.com/nerves-project/nerves_system_rpi3a)** | Nerves system for the Raspberry Pi 3 Model A+ w/ gadget mode and Raspberry Pi Zero 2 W | [![Hex.pm](https://img.shields.io/hexpm/v/nerves_system_rpi3a.svg)](https://hex.pm/packages/nerves_system_rpi3a) |
 | **[NervesSystemRPi4](https://github.com/nerves-project/nerves_system_rpi4)** | Base Nerves system configuration for the Raspberry Pi 4 | [![Hex.pm](https://img.shields.io/hexpm/v/nerves_system_rpi4.svg)](https://hex.pm/packages/nerves_system_rpi4) |
+| NervesSystemRPi5 | Not available yet. See the [discussion on ElixirForum](https://elixirforum.com/t/support-for-rpi-5/59915/3) for more info. | |
 | **[NervesSystemVultr](https://github.com/nerves-project/nerves_system_vultr)** | Experimental configuration for a Vultr cloud server | [![Hex.pm](https://img.shields.io/hexpm/v/nerves_system_vultr.svg)](https://hex.pm/packages/nerves_system_vultr) |
 | **[NervesSystemX86_64](https://github.com/nerves-project/nerves_system_x86_64)** | Generic Nerves system configuration x86_64 based hardware | [![Hex.pm](https://img.shields.io/hexpm/v/nerves_system_x86_64.svg)](https://hex.pm/packages/nerves_system_x86_64) |
 | **[NervesSystemGrisp2](https://github.com/nerves-project/nerves_system_grisp2)** |Base Nerves system configuration for the GRiSP 2 | [![Hex.pm](https://img.shields.io/hexpm/v/nerves_system_grisp2.svg)](https://hex.pm/packages/nerves_system_grisp2) |