Update README.md

README.md

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 This is a custom [Google Chrome](https://www.google.com/chrome/) extension that blocks pre-determined [URL](https://en.wikipedia.org/wiki/URL)s.
 
+## Installation
+
+1. Clone this repository, so it exists locally: `$ git clone https://github.com/picatz/cube.git`
+2. In your browser, open the Extension Management page by navigating to [chrome://extensions](chrome://extensions)
+3. Enable Developer Mode by clicking the toggle switch next to Developer mode.
+4. Click the LOAD UNPACKED button and select the extension directory (this repository, where it was cloned to).
+
 ## How does it work?
 
 The chrome browser exposes a [webRequest](https://developer.chrome.com/extensions/webRequest) API that enables plugin developers to observe and analyze traffic and to intercept, block, or modify requests in-flight. This makes it almost trivial to develop a URL blocking extension, which is exactly what `cube` does.