Add functionality to the demo extension

[fregante]

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Item name: TESTING: chrome-webstore-upload demo

Item ID: nphhdjlnhlicpjcpanamejkfehegdclg

Violation(s):

Building Quality Products - Minimum Functionality:

Violation reference ID: Yellow Potassium
Violation: The extension has no functionality or provides negligible utility to its users.
How to rectify: Ensure that your extension has a defined functionality which provides value.
Relevant section of the program policy:
Extensions must provide a basic degree of functionality and utility that provide value to the catalog of the Chrome Web Store. (learn more)

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