chore(goals): defining the first draft of a 1.0 ready Comet Game Engine

goals.md

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+# Goals of the Comet Game Engine
+
+Comet should be an unopinionated game engine built in Rust that tries to
+combine the simplicity of Raylib and modularity of Bevy without the user
+needing to become a follower of a cult.
+
+The engine itself should be expandable and swappable in its components.
+Don't like the standard 2D renderer? Just make your own, implement the
+`Renderer` trait and use it instead of the provided one.
+
+If you really don't want to work with the ECS, just ignore it and add
+your own custom `GameState` (or whatever you want to call it) struct
+and work on it using the tools provided to you by the engine.
+
+These things should be provided for an official 1.0 version of Comet:
+
+- [x] 2D rendering
+- [ ] 3D rendering
+- [ ] UI system
+- [ ] particle system
+- [x] ECS
+- [x] sound system
+- [ ] simple physics engine
+- [ ] multiple scenes (aka serialization and deserialization)
+- [ ] extensive documentation
+
+Future endeavors might include:
+
+- [ ] project creation tool
+- [ ] editor
+- [ ] scripting using Rhai