Add a README

README.md

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+# Godot demo projects
+
+Each folder containing an `engine.cfg` file is a demo project meant to
+be used with [Godot Engine](https://godotengine.org), the open source
+2D and 3D game engine.
+
+Those demos are distributed under the terms of the MIT license, as
+described in the [LICENSE.md](LICENSE.md) file.
+
+### Useful links
+
+ - [Main website](https://godotengine.org)
+ - [Source code](https://github.com/godotengine/godot)
+ - [Documentation](http://docs.godotengine.org)
+ - [Community hub](https://godotengine.org/community)