Add ProgressionKit to collection

Author: backslash-f

README.md

@@ -21,6 +21,7 @@ A collection of Swift Packages by ThatFactory.
 - 🌅 [ImageTools](https://github.com/thatfactory/image-tools): Multiplatform `PhotoKit`/`Core Graphics` wrapper.  
 - 📚 [LingoKit](https://github.com/thatfactory/lingokit): A plug-and-play, UI-agnostic Swift toolkit for building and scoring language-learning exercises.  
 - ⚡ [ObservableWebSocket](https://github.com/thatfactory/observable-websocket): Establishes `WebSocket` connections, publishes received messages/errors.   
+- 📈 [ProgressionKit](https://github.com/thatfactory/progresskit): A reusable progression engine that turns player performance into configurable XP, levels, and unlocks across games and apps.  
 - 🧰 [Toolbox](https://github.com/thatfactory/toolbox): A collection of useful Swift tools.
 
 # Integration

packages.json

@@ -30,6 +30,7 @@
     "observable object",
     "OSLog",
     "PhotoKit",
+    "progression",
     "reading",
     "speaking",
     "state machine",
@@ -74,6 +75,9 @@
     {
       "url": "https://github.com/thatfactory/observable-websocket.git"
     },
+    {
+      "url": "https://github.com/thatfactory/progresskit.git"
+    },
     {
       "url": "https://github.com/thatfactory/toolbox.git"
     }