feat(star-citizen): enabled star citizen on pc and created documentation

for install

home/programs/star-citizen/README.md

@@ -0,0 +1,110 @@
+# Star Citizen on Nixy
+
+This repo already includes Star Citizen support through `nix-citizen`.
+
+Relevant files:
+
+- `flake.nix` — declares the `nix-citizen` and `nix-gaming` inputs
+- `home/programs/star-citizen/default.nix` — Home Manager module that installs the chosen Star Citizen package
+- `home/programs/steam/system.nix` — Steam / gamescope / gamemode setup
+- `home/programs/group/gaming-apps.nix` — extra gaming tools such as `lutris`, `mangohud`, `protonup-qt`, and `wine`
+
+## Recommended package
+
+For most setups, start with:
+
+- `rsi-launcher-umu`
+
+If you want the game package instead of just the launcher, try:
+
+- `star-citizen-umu`
+
+The `*-umu` variants are usually the safest choice on Nix-based gaming setups because they are designed around UMU/Proton style runtime handling.
+
+## How to enable it
+
+Your laptop and home-pc profiles already import the module:
+
+- `hosts/laptop/home.nix`
+- `hosts/home-pc/home.nix`
+
+So you only need to turn it on in the relevant Home Manager config.
+
+Add or update:
+
+```nix
+programs.star-citizen = {
+  enable = true;
+  package = "rsi-launcher-umu";
+};
+```
+
+If you want the packaged game instead of the launcher, use:
+
+```nix
+programs.star-citizen = {
+  enable = true;
+  package = "star-citizen-umu";
+};
+```
+
+## Rebuild
+
+This flake exposes NixOS host outputs, so apply the change with your normal host rebuild command from the repo root:
+
+```bash
+sudo nixos-rebuild switch --flake .#thinkpad
+```
+
+or:
+
+```bash
+sudo nixos-rebuild switch --flake .#home-pc
+```
+
+If you’re building from one of the host directories directly, use the host-specific `nixos-rebuild` flow you already use in this repo.
+
+## First launch checklist
+
+Before launching the game, make sure:
+
+- `Steam` module is enabled
+- `gamescope` and `gamemode` are available
+- `protonup-qt` is installed so you can manage `GE-Proton` / `Wine-GE`
+- you have enough disk space for the launcher and game files
+- your GPU drivers are set up properly
+
+Useful tools already included in this repo:
+
+- `lutris`
+- `mangohud`
+- `goverlay`
+- `gamescope`
+- `gamemode`
+- `protonup-qt`
+- `winetricks`
+- `protontricks`
+
+## Notes
+
+- Star Citizen is a Windows game, so the launcher/game still downloads its own data after installation.
+- If the launcher starts but the game fails to launch, try switching the package to another `nix-citizen` option from `home/programs/star-citizen/default.nix`.
+- If you want overlay/performance debugging, launch the game with `MANGOHUD=1` or use the included `mangohud` / `goverlay` tools.
+
+## Troubleshooting
+
+### Launcher doesn’t appear
+
+- Rebuild the Home Manager profile
+- Check that `programs.star-citizen.enable = true;`
+- Confirm the module is imported in the host profile you are using
+
+### Launcher opens but game fails
+
+- Try `rsi-launcher-umu` or `star-citizen-umu`
+- Verify `protonup-qt` has a current `GE-Proton`
+- Make sure `gamescope` / `gamemode` are enabled in your gaming setup
+
+### Need a clean reset
+
+If you want to switch package variants, change `programs.star-citizen.package` and rebuild again. The package selection is the only thing the module installs.

hosts/home-pc/home.nix

@@ -60,6 +60,10 @@
 
   programs = {
     home-manager.enable = true;
+    star-citizen = {
+      enable = true;
+      package = "rsi-launcher-umu";
+    };
     nixy = {
       enable = true;
       configDirectory = config.var.configDirectory;