docs(credits): 📚️ add CREDITS.md

Giving credits to the friends we made along the way

CREDITS.md

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+# Credits
+
+## Direct contributors
+* **[Alistair3149](https://github.com/alistair3149)** authored *Citizen*.
+* **[Octfx](https://github.com/octfx)** wrote and refactored many of the PHP and JS used in *Citizen*. He helped test many of *Citizen's* latest features.
+* **[Other contributors](https://github.com/StarCitizenTools/mediawiki-skins-Citizen/graphs/contributors)** for PRs that keeps *Citizen* going.
+* **[Translatewiki.net translators](https://translatewiki.net/wiki/Translating:Citizen_Skin)** localized *Citizen* in different languages.
+
+## Indirect contributors
+* **[Jon Robson](https://github.com/jdlrobson)** for advocating and working in the MediaWiki skin ecosystem. It makes skin development much more accessible and makes many of *Citizen's* features possible.
+* **Wiki admins** who deploy *Citizen* on their wikis. It helps us test *Citizen* in different use cases, making it more versatile for the community.
+* **[Wikimedia Foundation Core Experiences teams](https://www.mediawiki.org/wiki/Core_Experiences)** for their extensive design research. It drives many of the design decisions in *Citizen* that would otherwise be unable to validate quantitatively.
+* **Various WMF Design Systems teams** for their effort to build, maintain, and implement design systems (MWUI, OOUI, Codex) across the MediaWiki ecosystem. It significantly reduces the work needed for *Citizen* to provide a cohesive design.
+* **Other WMF-deployed skins such as [Vector](https://www.mediawiki.org/wiki/Skin:Vector), [MinervaNeue](https://www.mediawiki.org/wiki/Skin:Minerva_Neue), and [Timeless](https://www.mediawiki.org/wiki/Skin:Timeless)** for some of the features and best practices in a MediaWiki skin. They became a part of the foundation of what *Citizen* has become today.
+
+## Included assets ##
+* **[Roboto Flex font](https://github.com/googlefonts/roboto-flex)**
+* **[Noto Sans CJK font](https://github.com/googlefonts/noto-cjk)**
+
+A gigantic thank you to all the folks above! *Citizen* wouldn't be here today without any of you. If someone is missing, please drop us a note and let us know!