Update README.md

Author: labnol

google-apps-script/factory-reset-gmail/README.md

@@ -1,7 +1,11 @@
 ## Nuke Gmail
 
 This Google Script will delete everything in your Gmail account.
+
 It removes email messages, filters, labels and reset all your settings
 
-### Handle with care, the process is irreversible
+[Factory Reset your Gmail Account](https://www.labnol.org/code/gmail-factory-reset-200531)
+
+#### ⚠️ Handle with care, the process is irreversible
 
+> This software is provided "as-is," without any express or implied warranty.