Update readme with offline bundle instructions

README.md

@@ -32,6 +32,13 @@ Furthermore, you will be able to provide the environment variables `REPO` and `T
 `REPO` is in format `Username/Repository` and defaults to `Weilbyte/PVEDiscordDark` (this repository).    
 `TAG` defaults to `master`, but it is strongly recommended to use the SHA-1 commit hash for security.
 
+## Offline bundle
+If desired, the installation utility can be run offline. Upon detecting a folder called `offline` in the current working directory, the script will enter offline mode and use the resources within that folder instead of retrieving them from GitHub.    
+
+The `offline` folder must have the following files: `meta/[imagelist, supported]`, `PVEDiscordDark/images/*`, `PVEDiscordDark/js/PVEDiscordDark.js`, `PVEDiscordDark/sass/PVEDiscordDark.css`
+
+You can find a zip containing the installer and offline folder under the artifact section of the GitHub Actions under this repository or as an asset attached to releases.
+
 ## Notes
 Thanks to [jonasled](https://github.com/jonasled) for helping out with the old version, and thanks to [SmallEngineMechanic](https://github.com/smallenginemechanic) for catching bugs for the rewrite!