update README

README.md

@@ -192,6 +192,21 @@ nix-shell --packages appimage-run
 appimage-run ~/Downloads/ubports-installer_0.10.0_linux_x86_64.AppImage
 ```
 
+## System information
+
+```shell
+nix-info -m
+```
+```
+ - system: `"x86_64-linux"`
+ - host os: `Linux 6.1.51, NixOS, 23.05 (Stoat), 23.05.3242.da5adce0ffaf`
+ - multi-user?: `yes`
+ - sandbox: `yes`
+ - version: `nix-env (Nix) 2.13.5`
+ - channels(root): `"nixos-23.05"`
+ - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`
+```
+
 ## General Notes
 
 * There is controversy about flakes, rather use channels (e.g. with niv)