citro2d Shapes example running on the 3DS with ctru-rs

[fatfingers23]

Hey, I wanted to share what I got working last night. It's just a simple proof of concept, and I'm not sure how far I will take it, but I've been reading through Discussions and issues the past couple of days and wanted to share.

I wanted to start making some simple 2D games, or proof of concept games at least with Rust. I found what was being done with the citro3d-rs crate. I cloned that repo and made a new citro2d-sys crate to see if I could get the 2d_shapes example from devkitPro/3ds-examples running with that on the 3DS.

Granted, it's the bare minimum to get it going with lots of unsafe's so does not feel very "rusty"

But it's working! I plan on looking at the citro3ds-rs crate and seeing what can be used from it and extended. Thanks for such a great project! I have really enjoyed working with it so far.