Move documentation outside of the root directory (#1936)

docs/CREDITS.md

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+# Contributors to RGBDS
+
+## Original author
+
+- Carsten Elton Sørensen <csoren@gmail.com>
+
+## Main contributors
+
+- Justin Lloyd <jlloyd@imf.la>
+- Vegard Nossum <vegard.nossum@gmail.com>
+- Anthony J. Bentley <anthony@anjbe.name>
+- stag019 <stag019@gmail.com>
+- Antonio Niño Díaz <antonio_nd@outlook.com>
+- Eldred "ISSOtm" Habert <me@eldred.fr>
+- Sylvie "Rangi" Oukaour <https://github.com/Rangi42>
+
+## Other contributors
+
+- Ben Hetherington <dev@ben-h.uk>
+- Björn Höhrmann <bjoern@hoehrmann.de>
+- Christophe Staïesse <chastai@skynet.be>
+- David Brotz <dbrotz007@gmail.com>
+- Evie <https://evie.gbdev.io>
+- James "JL2210" Larrowe <https://github.com/JL2210>
+- Maja Kądziołka <github@compilercrim.es>
+- The Musl C library <https://musl.libc.org/>
+- obskyr <powpowd@gmail.com>
+- The OpenBSD Project <http://www.openbsd.org>
+- Quint Guvernator <quint@guvernator.net>
+- Sanqui <gsanky@gmail.com>
+- YamaArashi <shadow962@live.com>
+- yenatch <yenatch@gmail.com>
+- phs <phil@philhsmith.com>
+- jidoc01 <jidoc01@naver.com>
+
+[<img src="https://contrib.rocks/image?repo=gbdev/rgbds">](https://github.com/gbdev/rgbds/graphs/contributors)
+
+Contributor image made with [contrib.rocks](https://contrib.rocks).
+
+## Acknowledgements
+
+RGBGFX generates palettes using algorithms found in the paper
+["Algorithms for the Pagination Problem, a Bin Packing with Overlapping Items"](https://arxiv.org/abs/1605.00558)
+([GitHub](https://github.com/pagination-problem/pagination), MIT license),
+by Aristide Grange, Imed Kacem, and Sébastien Martin.
+
+RGBGFX's color palette was taken from [SameBoy](https://sameboy.github.io), with
+permission and help by [LIJI](https://github.com/LIJI32).