Bevy ECS readme: not working example due to missing #[derive(Component)]

[QQism]

Hi everyone,

I'm tinkering with bevy_ecs and just realized that its README is not up-to-date with the recent change making #[derive(Component)] mandatory for all component structs.

Specifically

bevy/crates/bevy_ecs/README.md

Lines 100 to 130 in 6a8a8c9

	struct Velocity {
	x: f32,
	y: f32,
	}
	struct Position {
	x: f32,
	y: f32,
	}
	// This system moves each entity with a Position and Velocity component
	fn movement(query: Query<(&mut Position, &Velocity)>) {
	for (mut position, velocity) in query.iter_mut() {
	position.x += velocity.x;
	position.y += velocity.y;
	}
	}
	fn main() {
	// Create a new empty World to hold our Entities and Components
	let mut world = World::new();
	// Spawn an entity with Position and Velocity components
	world.spawn()
	.insert(Position { x: 0.0, y: 0.0 })
	.insert(Velocity { x: 1.0, y: 0.0 });
	// Create a new Schedule, which defines an execution strategy for Systems
	let mut schedule = Schedule::default();

Attempt to run the example would result in errors as below

the trait `bevy_ecs::component::Component` is not implemented for `Position`
the trait `bevy_ecs::component::Component` is not implemented for `Velocity`

Also, it could be worth it to mention that components are Rust structs but also need to implement bevy_ecs's Component trait.

bevy/crates/bevy_ecs/README.md

Lines 25 to 29 in 6a8a8c9

	Components are normal Rust structs. They are data stored in a `World` and specific instances of Components correlate to Entities.
	```rust
	struct Position { x: f32, y: f32 }
	```

[DJMcNab]

Indeed, thanks for pointing it out

The license badge is also outdated

[mockersf]

#2575 should help avoid this issue as code blocks in readme will be tested