Add screenshot of the graphical sudo password prompt

Author: aral

README.md

@@ -16,7 +16,7 @@ npm i @small-tech/auto-encrypt-localhost
 
 Note that during installation, Auto Encrypt Localhost will create your local certificate authority and install it in the system root store and generate locally-trusted certificates. These actions require elevated privileges (`sudo`). Since [npm does not handle sudo prompts correctly in lifecycle scripts](https://github.com/npm/cli/issues/2887), you will see a graphical sudo prompt pop up to ask you for your adminstrator password. Once you’ve provided it, installation will proceed as normal.
 
-
+![Screenshot of graphical sudo prompt “Authentication required: Authentication is needed to run /bin/bash as the super user”](https://small-tech.org/images/graphical-sudo-prompt.png)
 
 ## Usage