Update README.md

Author: pergerch

README.md

@@ -2,24 +2,30 @@
 
 Command line tool to upload files using the Windows context menu.
 
+__Note:__ Windows only. The actual uploading is not implemented. The tool is a template for adding a context menu item to the Windows context menu.
+
 ## Installation
 
 Register the context menu item for files and folders.
 
 ```bash
-ContextMenuUploader --register    
+ContextMenuUploader --register
 ```
 
 Unregister the context menu item for files and folders.
 
 ```bash
-ContextMenuUploader --unregister    
+ContextMenuUploader --unregister
 ```
 
 ## Usage
 
 Right-click on a file or folder and select "Upload to web service" from the context menu.
 
+## Debug
+
+Debug information is written to the file `ContextMenuUploader.log` in the directory `C:\temp`, if exists.
+
 ----
 
 Made with :heart: by [Spatial Focus](https://spatial-focus.net/)