Add copyright notices for organism code [ci skip]

The original code is licensed under MPL, we have an explicit permission to include it under MIT.

AUTHORS.md

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+# doukutsu-rs Contributors
+
+This file recognizes the people who have made meaningful contributions to doukutsu-rs through code, bug fixes, features, and other improvements.
+
+Contributors are listed based on their level of involvement, with a focus on those who have made 5 or more commits or contributed substantial features. This list doesn't represent legal copyright - check the git log for detailed code authorship.
+
+All GitHub profiles are linked for easy reference.
+
+## Active Maintainers
+
+These contributors actively maintain the project and review contributions:
+
+**[alula](https://github.com/alula)**
+**[dawndus](https://github.com/dawndus)**
+**[jozsefsallai](https://github.com/jozsefsallai)**
+**[biroder](https://github.com/biroder)**
+
+## Regular Contributors
+
+Contributors with multiple commits or major feature work:
+
+**[periwinkle9](https://github.com/periwinkle9)**
+**[DrGlaucous](https://github.com/DrGlaucous)**
+**[khang06](https://github.com/khang06)**
+**[mokurin000](https://github.com/mokurin000)**
+**[JakeV-1](https://github.com/JakeV-1)**
+
+## Other Contributors
+
+People who have made valuable contributions to the codebase:
+
+**[beholdnec](https://github.com/beholdnec)**
+**[GiantBlargg](https://github.com/GiantBlargg)**
+**[tranzystorekk](https://github.com/tranzystorekk)**
+**[IruzzArcana](https://github.com/IruzzArcana)**
+**[M0REKZ](https://github.com/M0REKZ)**
+**[vrmiguel](https://github.com/vrmiguel)**
+**[tulilirockz](https://github.com/tulilirockz)**
+
+## Artwork & Design
+
+**[@Daedliy](https://twitter.com/Daedliy)** - Original "Crab Sue" character design and sketch-style doukutsu-rs logo
+**[AppleHair](https://github.com/AppleHair)** - New cute "Crab Sue" icon art for all platforms
+
+## Built Upon
+
+doukutsu-rs incorporates and builds upon these external works:
+
+**[ggez](https://github.com/ggez/ggez)** - Original framework that doukutsu-rs was built on; a derivative of it's VFS implementation and other components remain in the codebase
+**[Clownacy](https://github.com/Clownacy)** - Implementation concepts from CSE2-Enhanced and Cave Story Mod Loader
+**[LunarLambda](https://github.com/doukutsu-rs/organism)** - Organism Rust Organya sound format player library, enhanced and integrated into doukutsu-rs
+**[Zoroyoshi](http://z.apps.atjp.jp/k12x10/)** - k12x10 public domain bitmap font (current built-in font)
+**[/efont/ Shinonome](http://openlab.ring.gr.jp/efont/shinonome/)** - Shinonome Public domain bitmap font family (used in early 2020 versions)
+
+---
+
+_See the full list of all code contributors on [GitHub](https://github.com/doukutsu-rs/doukutsu-rs/graphs/contributors)._

src/sound/org_playback.rs

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+// SPDX-License-Identifier: MIT
+// Copyright (c) 2020 LunarLambda
+// Copyright (c) 2020 doukutsu-rs contributors (see AUTHORS.md)
 use std::cmp::min;
 use std::hint::unreachable_unchecked;
 use std::mem::MaybeUninit;

src/sound/organya.rs

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+// SPDX-License-Identifier: MIT
+// Copyright (c) 2020 LunarLambda
+// Copyright (c) 2020 doukutsu-rs contributors (see AUTHORS.md)
 use std::io;
 
 use byteorder::{LE, ReadBytesExt};

src/sound/stuff.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2020 LunarLambda
+// Copyright (c) 2020 doukutsu-rs contributors (see AUTHORS.md)
 pub const FRQ_TBL: [i16; 12] = [
     262, 277, 294, 311, 330, 349, 370, 392, 415, 440, 466, 494
 ];

src/sound/wav.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2020 LunarLambda
+// Copyright (c) 2020 doukutsu-rs contributors (see AUTHORS.md)
 use std::fmt;
 use std::io;
 use std::io::ErrorKind;

src/sound/wave_bank.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2020 LunarLambda
+// Copyright (c) 2020 doukutsu-rs contributors (see AUTHORS.md)
 use std::fmt;
 use std::io;
 use std::sync::Arc;