Update README.md

Author: eyny

README.md

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-# jumpy
-One-tap platform game made in Godot Engine
+
+# Jumpy
+One-tap platform game made in [Godot Engine](https://github.com/godotengine), a free and open source 2D and 3D game engine. You make a jelly-like thing called **Jumpy** to jump buy tapping to screen or presing the space key. A simple, but fun and addictive game.
+
+This project contains nice examples for signals, groups and C# scripting for people who wants to work with Godot Engine. Although originally planned to be released for smartphones, it is only released for Linux and Windows, because Godot Engine does not support exporting to Android or iOS platforms at the moment.
+
+Huge thanks to [Kenney](https://kenney.nl/) for its adorable and free graphics.
+
+## Screenshot
+<img src="screenshot.png" width="270" height="480">