feat: Add Foundry V13 compatibility, hide the system tracker when detached, and include a new README.

README.md

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+# Daggerheart Countdowns Plus
+
+A simple module for the **Daggerheart** system on Foundry VTT that improves the usability of the countdown tracker.
+
+## Features
+
+- **Detachable Tracker**: Adds a "Detach" button to the default systems countdown/fear tracker.
+- **Movable Window**: The detached tracker opens in its own window that can be dragged anywhere on the screen, minimizing obstruction of the game canvas.
+- **System Tracker Integration**: While the detached tracker is open, the default system tracker (pinned to the top right) is hidden to avoid clutter. Closing the detached tracker automatically restores the system tracker.
+
+## Installation
+
+1.  Open the Foundry VTT Setup screen.
+2.  Go to **Add-on Modules**.
+3.  Click **Install Module**.
+4.  Search for "Daggerheart Countdowns Plus" or paste the manifest URL.
+5.  Click **Install**.
+
+## Usage
+
+1.  Open a world with the **Daggerheart** system.
+2.  Enable the **Daggerheart Countdowns Plus** module in **Game Settings** > **Manage Modules**.
+3.  Look for the "Detach" icon (an arrow pointing out of a square) in the header of the standard Countdown/Fear tracker.
+4.  Click it to pop out the tracker into a movable window.