Merge pull request #3 from sassdawe/update-readme

docs(readme) clarified versions

readme.md

@@ -1,12 +1,26 @@
 # PnP PowerShell Sharing Settings as Code
 
-> credit goes to [aakashbhardwaj619](https://github.com/aakashbhardwaj619) as I built this action based on his work.
+This action signs in into SharePoint Online using PnP PowerShell and sets the sharing capability for the specified site collections.
 
-This action signs in into SharePoint Online using ACS and sets the sharing settings for the site collections.
+> ⚠️ **Important**: There are multiple versions of this action available. Please make sure you are using the correct version for your needs.
 
-If `ALLELSE` is used for any of the settings (but only for **ONE** of them), it will apply that sharing capability to all the rest of the sites which were NOT specified in the other settings. If `null` is used for any of the settings, it will skip that setting.
+## Variants
 
-> !Important: The v1 version requires the use of **Windows** based runners to run this action currently.
+### Version 1
+
+Version 1 is limited to Windows based GitHub Actions runners and uses the `SharePointPnPPowerShellOnline` module to set the sharing capability for the specified site collections. It uses ACS App-Only authentication to connect to SharePoint Online. You can read more about the specifics in the [readme for version 1](https://github.com/sassdawe/pnp-sharing-settings-action/tree/version-one).
+
+### Version 2
+
+With Version 2 this action has switched to use the `PnP.PowerShell` module and supports all runner OS types: Windows, Linux and macOS as well. It is still using ACS App-Only authentication to connect to SharePoint Online. You can read more about the specifics in the [readme for version 2](https://github.com/sassdawe/pnp-sharing-settings-action/tree/version-two).
+
+### Version 3 (in development)
+
+Version 3 will switch to standard Entra ID app-only authentication to connect to SharePoint Online, and stop relying on ACS App-Only authentication. This will make the action more secure and reliable.
+
+## Usage
+
+The action takes 3 mandatory parameters for sign-in and 4 optional parameters to specify the sharing capability of the site collections. The sites can be specified using their full URLs or with the `ALLELSE` keyword. When `ALLELSE` is used for any of the settings (but only for **ONE** of them), it will apply that sharing capability to all the rest of the sites which were NOT specified in the other three settings. If `null` is used for any of the settings, it will skip that setting.
 
 ## Inputs
 
@@ -40,12 +54,12 @@ Comma separated list of URLS where to enable sharing capability for existing ext
 
 ## Outputs
 
-There is no output for this action.
+There is no output for this action. 🚩 But keep in mind that the generated logs will contain the specified URLs, and anyone with access the GitHub Actions logs will see which site has which sharing capability enforced. 🚩
 
 ## Example usage
 
 ```yaml
-uses: actions/pnp-sharing-settings-action@v1
+uses: sassdawe/pnp-sharing-settings-action@v2
 with:
     SHAREPOINT_ADMIN_URL: 'https://contoso-admin.sharepoint.com'
     CLIENT_ID: ${{ secrets.CLIENT_ID }}