Update README.md

Author: Narwher

README.md

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 # Howard
-Old school, cross-platform action game
+Cross platform, retro shoot-em-up inspired by games like Thexder, Metroid and Cave Story. It's written in GameMaker Studio 1.4.
+
+## How to Play
+Howard runs natively on Windows and Mac OS X, and in most browsers. Works on mobile devices as well, with in-progress touch screen support. There is a also a PlayStation Vita port.
+
+The game is still in development, with only one level and many bugs. There's no sound or music yet. 
+
+Download or play the latest build [here!](https://legitvidya.itch.io/howard)
+
+<img src="example.gif"/>