feat: add better credits

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Add proper crediting
+
 ### Added
 
 - **actor2D:** Make hitbox modifiable.

CREDITS.md

@@ -0,0 +1,19 @@
+# gamecore credits
+
+## Library used
+
+- [Binser](https://github.com/bakpakin/binser) under MIT Licence
+
+- [Classic](https://github.com/rxi/classic) under MIT Licence
+
+- An altered version of [CScreen](https://github.com/CodeNMore/CScreen) under a custom licence.
+
+- [LoveBird](https://github.com/rxi/lovebird) under MIT Licence
+
+- [Bump.lua](https://github.com/kikito/bump.lua), under MIT Licence
+
+- [Bump.3DPD](https://github.com/oniietzschan/bump-3dpd), under MIT Licence
+
+- [Tsort](https://github.com/bungle/lua-resty-tsort), under BSD-2 Clause
+
+- [Simple Tiled Implementation](https://github.com/karai17/Simple-Tiled-Implementation), under MIT Licence