Update readme, add up to date screenshot

closes gdquest-demos#17

Author: NathanLovato

README.md

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+# Free Godot 3 demos
+
+Here are all the Godot 3 code projects from our tutorials on the [ GDquest Youtube channel ](http://youtube.com/c/gdquest).
+
+![Four screenshots of the projects in Godot](https://raw.githubusercontent.com/GDquest/Godot-engine-tutorial-demos/master/img/godot-3-demos-fs8.png)
+
+## Links
+
+1. [Godot 3 tutorials](https://www.youtube.com/playlist?list=PLhqJJNjsQ7KF0o0ke_CA2QlqK8BxQNSFS)
+2. [Godot 3 course](https://gumroad.com/gdquest) (Premium)
+
+GDquest is on [ Twitter ](https://twitter.com/NathanGDquest), [Facebook](https://www.facebook.com/gdquest/) and [Discord](https://discord.gg/87NNb3Z)
+
+## Available demos
+
+You can find all the Godot 3 demos are in the `/2018` folder.
+
+- **Tool mode draw in viewport**
+- **Camera 2d rig**
+- **Character scene setup**
+- **Astar pathfinding**
+- **Simple sword attack**
+- **Finite state machine**
+- **Screen sizes example**
+- **Game user interface**
+- **Intro to ui containers**
+- **Title screen** with keyboard and mouse support
+- **Grid based movement** in 2d
+
+And more to come!
+
+Some projects have both a `start` and an `end` version so you can follow along with the [ tutorials ](https://www.youtube.com/playlist?list=PLhqJJNjsQ7KF0o0ke_CA2QlqK8BxQNSFS) and use the final result as a reference.
+
+## Contributors welcome!
+
+If you find bugs, feel free to [ open an issue ](issues) and to submit a Pull Request!
+
+## Credits
+
+- Guilherme Oliveira, [ Godot instructor on Udemy ](https://www.udemy.com/godotcourse/?couponCode=LUVGODOT)
+- Henrique Campos aka [ Pigdev ](https://pigdev.itch.io/)
+- Lars Kokemohr, dean of engineering at the [school4games Berlin](http://school4games.net/)
+
+
+These demos were made possible by the 760 generous supporters who backed [Make Professional 2D Games with Godot](https://www.kickstarter.com/projects/gdquest/make-professional-2d-games-godot-engine-online-cou) on Kickstarter, and everyone who supports GDquest.