update readme

added URL to subscribing page with utm params

Author: Chippd

README.md

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 This is continuing on my odd fascination with animation in the browser, building on my previous attempt at an [animated SVG graphic](http://chrisdermody.com/animated-svg-loader-mydevportfol-io/) that would illustrate that an app was "coding" a website, originally built for my side project [MyDevPortfolio](https://mydevportfol.io)
 
 [view the animation](https://chippd.github.io/css_loading_animation/)
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+## Tutorial
+If you'd like to see how easy this can be done, I'll be creating a tutorial in an upcoming post. Get notifified about it [here](http://chrisdermody.com/subscribing/?utm_source=github&utm_medium=css-loader-repo&utm_campaign=eng_mark).
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+I'm [@cderm](https://twitter.com/cderm) on Twitter too ;)