Improve README

Author: manuq

README.md

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-# godot-block-coding-demos
+# Demos for Godot Block Coding plugin
+
+These are demos for the [Godot Block Coding
+Plugin](https://github.com/endlessm/godot-block-coding). Intended to
+show the potential and find limitations on the plugin, in order to
+instruct its development.

game-05/README.md

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+# Spaceship demo
+
+## About
+
+This is a top-down game featuring the "move like a spaceship" block in
+the SimpleCharacter node. It is a more complete game based on the
+knowledge gained in the previous demos.
+
+## Implementation
+
+The inventory was done with boolean variables in the block
+coding. There are "has_blue_key" and a "has_blaster" in the block
+canvas for the ship.
+
+A couple mechanics have been implemented with basic collision
+detection of Area2D "on body entered/exited". For instance:
+- Camera zoom in and out when the player ship enter/leaves a specific
+  zone.
+- Open door when the player ship gets near the door and has a key.
+- Change a flag like "has_blue_key" when the player ship grabs the
+  blue key. Play an animation in that case too.
+- Present messages on screen.
+
+I was able to push the asteroids with the blasters by adding
+AnimatableBody2D nodes to them and then animating them.
+
+Aesthetics: Sprites with CanvasTextures (diffuse and normal map) are
+used to give a 3D look, while still being 2D. Adding PointLight2D and
+LightOccluder2D nodes complete the effect. Also a CanvasModulate node
+is used in the main scene to darken the level.
+
+## Limitations found
+
+There is no current way of spawning objects. That's why the blasters
+are implemented as an animation and they are fixed to the player
+ship. Rotating the ship rotates the blasters which is not what I
+wanted.
+
+I wanted asteroids to have health and destroy with an animation, but
+the only option today is to use the "queue free" block on them. We
+need to fix the "call method in node" block to reference a node in a
+instantiated scene like this.