Create listing of game engines with links to packaged app instructions.

chrome/common/extensions/docs/templates/articles/game_engines.html

Index: chrome/common/extensions/docs/templates/articles/game_engines.html
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+<h1>Game Engines</h1>
+
+
+<p>
+Several graphically intense interactive application frameworks / game engines
+exist that target web technologies. The following are some we recommend with
+instructions for producing a Chrome App.
+</p>
+
+
+<h2 id="playcanvas">PlayCanvas</h2>
+<p>
+<a href="https://playcanvas.com/">https://playcanvas.com/</a>
+</p>
+
+<p>
+PlayCanvas demo on Chrome Web Store:
+<a href="https://chrome.google.com/webstore/detail/swooop/jblimahfbhdcengjfbdpdngcfcghladf?hl=en-US">Swooop</a>
+<img src="{{static}}/images/swooop.png"
+     width="460"
+     height="340"
+     alt="Promotional image for Swoop demo showing a biplane.">
+</p>
+
+<p>
+"PlayCanvas is a visual development platform for 3D web content. Both the
+tools and the web apps you build are powered by HTML5. The entire software
+platform is web hosted so there's nothing to install and you can access your
+work from any device that runs one of the supported web browsers." - <a
+href="http://developer.playcanvas.com/user-manual/introduction/">PlayCanvas
+User Manual</a>
+</p>
+
+<p>
+PlayCanvas exports content that requires a small amount of manual work to
+package into a Chrome App. See: 
+<a href="http://developer.playcanvas.com/user-manual/publishing/chromewebstore/"
+>PlayCanvas Packaged App Publishing Documentation</a>.
+</p>