Add README credits

Author: Unchained112

README.md

@@ -1,2 +1,29 @@
 # SimpleTemplateMainMenu
- Simple main menu template for Godot 4
+
+Simple main menu template for Godot 4
+
+The default play scene includes a white box that can be moved with W, A, S, D.
+
+Features:
+
+- A basic start menu with Play, Options, and Quit buttons.
+- A basic options menu with three tabs:
+    - Video tab: Fullscreen, Borderless, Vsync
+    - Music tab: Master, Music, Sound Effects
+    - Control tab: Up, Down, Left, Right
+- A sample control testing scene (Press the Play button in the start menu)
+- An auto-loaded Scene Manager
+- Persistence (Not available in the web build)
+- An auto-loaded Audio Manager
+- Support for keyboard-only control (grab-focus in every menu)
+
+PS:
+
+- Persistence and Scene Manager are both located in Utilities.
+- Persistence is not enabled by default; set it in Utilities.gd using is_persistence."
+
+Credits:
+- [Minimalistic UI Theme for Godot Games](https://itch.io/queue/c/1473270/themes-for-godot-games?game_id=1091572)
+- [Cubic-11 font](https://github.com/ACh-K/Cubic-11)
+- [Universal UI/Menu Soundpack](https://ellr.itch.io/universal-ui-soundpack)
+- [Music Loop Bundle](https://tallbeard.itch.io/music-loop-bundle)