Update README.md

add sample image

README.md

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 This extension brings the following functionality to ungoogled-chromium (and other forks that lack web store support):
 - Allows installing extensions directly from chrome web store.
 - Automatically checks for updates to your installed extensions and displays them on the badge.
+![Example Image](https://raw.githubusercontent.com/NeverDecaf/chromium-web-store/master/sample.png)
 #### Usage
 - If you wish to install extensions directly instead of just downloading the crx, you must change the flag `chrome://flags/#extension-mime-request-handling` to `Always prompt for install`.
 - Available extension updates will display on the badge, click to install them (note that non-webstore extensions may need to be installed manually even if you have the flag set.)