add windows entry in gaming pc

hosts/gaming-pc.nix

@@ -9,8 +9,26 @@
   hardware.enableRedistributableFirmware = true;
 
   # Bootloader.
-  boot.loader.systemd-boot.enable = true;
+  boot.loader.systemd-boot = {
-  boot.loader.systemd-boot.graceful = true;
+    enable = true;
+    graceful = true;
+    windows = {
+        "windows" =
+          let
+            # To determine the name of the windows boot drive, boot into edk2 first, then run
+            # `map -c` to get drive aliases, and try out running `FS1:`, then `ls EFI` to check
+            # which alias corresponds to which EFI partition.
+            boot-drive = "FS0";
+          in
+          {
+            title = "Windows";
+            efiDeviceHandle = boot-drive;
+            sortKey = "y_windows";
+          };
+      };
+    edk2-uefi-shell.enable = true;
+    edk2-uefi-shell.sortKey = "z_edk2";
+  };
   boot.loader.efi.canTouchEfiVariables = true;
 
   # Kernel