updated README.md with some warnings

README.md

@@ -1,6 +1,13 @@
 # NixOS configuration
 ![NixOS configuraton](/assets/example.png)
 ###  Installation guide
+
+⚠️ **Note:**  
+Before using on another system, review:
+- hostName
+- hardware options
+
+
 You need to have `git` installed before installing the config.
 ```shell
 cd
@@ -9,6 +16,7 @@ cd ./nixos
 sudo nixos-rebuild switch --flake ~/nixos/#laptop
 ```
 
+
 ### Things that don't work reliably and need manual setting.
 - Librewolf's extension's settings
 - Librewolf's bookmarks