add credits link to starting modal (#2333)

## Description:

* Create CREDITS.md
* add all link to it on loading page

<img width="338" height="254" alt="Screenshot 2025-10-30 at 6 24 07 PM"
src="https://github.com/user-attachments/assets/5e89c846-f672-44e1-9add-3d03608c849e"
/>


## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

resources/lang/en.json

@@ -262,8 +262,8 @@
   },
   "game_starting_modal": {
     "title": "Game is Starting...",
-    "code_license": "Code licensed under AGPL-3.0",
-    "desc": "Preparing for the lobby to start. Please wait."
+    "credits": "Credits",
+    "code_license": "Code licensed under AGPL-3.0"
   },
   "difficulty": {
     "difficulty": "Difficulty",