Updated Readmes and created CREDITS file

CREDITS.md

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+# Languages
+- **Bulgarian**: by TST_Gogo_, Gothika_47
+- **Chinese**: by Xheepey87, frto027
+- **Czech**: by David Kapitančik. Picus, domcizzz
+- **Dutch**: by SomethingMax
+- **English**: by Wofsauge, Buurazu, Ma-rcx, AutisticGoat, ...
+- **French**: by Nicolas Delvaux
+- **German**: by Jake
+- **Greek**: by vanillarat
+- **Italian**: by Klyser8, Denkishi, 2G
+- **Japanese**: by prefab
+- **Korean**: by Blackcreamtea, 미카
+- **Polish**: by Rickyy, Kennyluz, MERITT, DimonoKingoKongo
+- **Portuguese**: by Marcelino Cruz
+- **Russian**: by hell2Pay, fly_6, Dezzelshipc and Sekaz
+- **Spanish**: by Lidia Arroyo Purroy
+- **Brazilian - Portuguese**: by LuanRoger and NotZin02
+- **Turkish**: by Cagdas Salur, Mert Dutal
+- **Ukrainian**: by x3xto
+
+
+# Special Thanks to
+- [The Binding of Isaac Wiki](https://bindingofisaacrebirth.fandom.com/wiki/Binding_of_Isaac:_Rebirth_Wiki) and [platinumgod.co.uk](https://platinumgod.co.uk/) for providing useful item descriptions
+- Buurazu for all the hard work improving the mod :)
+- [eyeguy](https://twitter.com/eyeguyart) for creating the astonishing transformation icons
+- [adc](https://steamcommunity.com/id/whytefang/) for creating an awesome new language pack and providing ideas for new functionalities