Update README.md

README.md

-# What is Phaser 3
+# What is Phaser?
 Phaser is game framework for desktop and mobile via html5. 
 Phaser can be used based on JavaScript or TypeScript. 
 Phaser uses canvas and WebGL renderer which makes more easier to use both desktop and mobile.
  However, if you want to make game in modile environment not using mobile web browser, you should look for 3rd party app.
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+ For more details about Phaser 3, you can see below references
+ <strong>Phaser Website</strong>: [Phaser website](https://phaser.io)