Add a README.

README.md

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+# Bricassé
+Help Chacha break those bricks.
+
+A little brick breaking game, mainly made to learn to use the Godot game engine.
+
+## Credits - Copyrights
+© Feufochmar, 2021.
+
+All files not listed below were made by Feufochmar, and are released under a Creative Commons CC BY-SA licence.
+
+The file `screens/NovaOval.ttf` was made by Wojciech Kalinowski "wmk69", and is released under the OFL (SIL Open Font License). [Website](https://fontlibrary.org/en/font/nova)
+
+## Development
+
+### Adding a new level
+Inherit from `levels/base_level.tscn` and add blocks.
+
+### Adding a new block
+Inherit from `blocks/abstract_brick.tscn`, then :
+ - add a Sprite, and associate the script `blocks/abstract_brick_sprite.gd` to it.
+ - add a Collision shape