docs: add credits (#1755)

Co-authored-by: Alejandro Santiago <[email protected]>
Co-authored-by: Felix Angelov <[email protected]>

Author: alestiago

CREDITS.md

@@ -0,0 +1,7 @@
+# Credits
+
+This project owes its success to the following people and organizations:
+
+## Acknowledgments
+
+- [Very Good Ventures](https://verygood.ventures/): who originally developed [Dart Frog](https://github.com/dart-frog-dev/dart_frog) and then transferred it to the [Dart Frog organization](https://github.com/dart-frog-dev). Learn more at ["Dart Frog Has Found a New Pond!"](https://verygood.ventures/blog/dart-frog-has-found-a-new-pond).

README.md

@@ -9,7 +9,7 @@
 
 A fast, minimalistic backend framework for Dart 🎯
 
-Developed with 💙 by [Very Good Ventures][very_good_ventures_link] 🦄
+[Originally developed][credits_link] by [Very Good Ventures][very_good_ventures_link] 🦄
 
 ## Documentation 📝
 
@@ -105,3 +105,4 @@ Dart Frog provides a simple core with a small API surface area in order to reduc
 [very_good_analysis_badge]: https://img.shields.io/badge/style-very_good_analysis-B22C89.svg
 [very_good_analysis_link]: https://pub.dev/packages/very_good_analysis
 [very_good_ventures_link]: https://verygood.ventures
+[credits_link]: ./CREDITS.md#acknowledgments