Cameron Hart ac63c491fb Simple 2d rotation example (#3065) ...

# Objective

Some new bevy users are unfamiliar with quaternions and have trouble working with rotations in 2D.

There has been an [issue](https://github.com/bitshifter/glam-rs/issues/226) raised with glam to add helpers to better support these users, however for now I feel could be better to provide examples of how to do this in Bevy as a starting point for new users.

## Solution

I've added a 2d_rotation example which demonstrates 3 different rotation examples to try help get people started:

- Rotating and translating a player ship based on keyboard input
- An enemy ship type that rotates to face the player ship immediately
- An enemy ship type that rotates to face the player at a fixed angular velocity

I also have a standalone version of this example here https://github.com/bitshifter/bevy-2d-rotation-example but I think it would be more discoverable if it's included with Bevy.

2022-01-25 22:10:11 +00:00

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