docs: README lists the sources and projects Steamify builds on, with licences and thanks

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

README.md

@@ -187,6 +187,51 @@ Contributing (or an AI agent)? Read [AGENTS.md](AGENTS.md).
 
 MIT - do whatever you want with it. See [LICENSE.md](LICENSE.md).
 
+## Sources and credits
+
+Steamify is glue around other people's work. It installs, configures or
+downloads the following, and doesn't claim any of it:
+
+| Project | What Steamify uses it for |
+|---|---|
+| [CachyOS](https://cachyos.org) | The distribution it targets, and its packages: `cachyos-vapor` (the Vapor theme), the gamescope session packages (`gamescope-session-cachyos` and the autologin helpers), `dmemcg-booster` and `plasma-foreground-booster` (VRAM booster), and the `xone` / `xpadneo` DKMS packages (extended controller support) |
+| [Valve / SteamOS](https://github.com/ValveSoftware/SteamOS) | The behaviour it imitates (`steam-set-session`, `steamos-manager`, the Steam Deck UI). Downloaded from Valve's package mirror at install time, never shipped here: `steamdeck-kde-presets` (the SteamOS extras, installed under `/usr/local`), the Steam Machine BIOS package and its checksums, and the SteamOS release number shown in Steam's System settings. The gear icon (`assets/steam-gaming-settings.svg`) is Valve's *Return to Gaming Mode* icon (GPL-2.0) with a gear |
+| [Steam](https://store.steampowered.com) and [gamescope](https://github.com/ValveSoftware/gamescope) | The client and the compositor the gaming session is built on |
+| [evlaV/linux-integration](https://github.com/evlaV/linux-integration) | Valve's `cros_ec_cec` kernel driver (GPL-2.0) for the Steam Machine's HDMI-CEC, downloaded at a pinned commit and checksum, then patched by `patches/cros-ec-cec-single-port.patch` |
+| `leds-valve-dkms-git` (AUR) | The Steam Machine's front LED bar driver |
+| [KDE Plasma](https://kde.org/plasma-desktop/), SDDM, plasma-login-manager | The desktop and the login managers whose settings it edits (`kwriteconfig6`, `lookandfeeltool`) |
+| [DKMS](https://github.com/dell/dkms), [fwupd](https://fwupd.org), [yay](https://github.com/Jguer/yay) / [paru](https://github.com/Morganamilo/paru) | Building kernel modules, flashing the BIOS, and installing AUR packages |
+| [PySide6 / Qt](https://doc.qt.io/qtforpython-6/) | The graphical app |
+
+Licences: Steamify itself is MIT. `patches/steamify-fremont-poweroff.c` is a
+kernel module and therefore GPL-2.0 (see its SPDX header), and the CEC
+driver it patches is GPL-2.0 too. Each of the projects above keeps its own
+licence.
+
+The problems other people found first are credited where they were used: the
+[SteamOS](https://github.com/ValveSoftware/SteamOS/issues/2626) and
+[CachyOS gamescope-session](https://github.com/CachyOS/gamescope-session/issues/9)
+issues linked in [TECHNICAL.md](TECHNICAL.md).
+
+### Mentions
+
+Thanks to:
+
+- The **CachyOS** team and packagers, for a distribution that makes this
+  possible and for the gamescope session packages Steamify builds on.
+- **Valve**, for SteamOS, for publishing its package repositories and the
+  Steam Machine's kernel sources, and for Steam and gamescope.
+- **evlaV** for the public `linux-integration` mirror of Valve's kernel,
+  without which the Steam Machine's CEC driver would be out of reach.
+- The maintainers of **`leds-valve-dkms-git`**, **xone**, **xpadneo**,
+  **dmemcg-booster** and **plasma-foreground-booster**.
+- The **KDE**, **Arch Linux** and **AUR** communities, and the authors of
+  **yay** and **paru**.
+- Everyone who reported problems or tested on real hardware.
+
+If something here is missing or wrongly credited, open an issue or a pull
+request and it will be fixed.
+
 ## Disclaimer
 
 Steamify CachyOS is an unofficial community project. It is not affiliated