Add doc to script file

src/App.tsx

@@ -1,3 +1,14 @@
+/**
+ * Medication Plan Assistant - Main Application
+ *
+ * A pharmacokinetic simulation tool for lisdexamfetamine (Elvanse/Vyvanse)
+ * medication planning. Helps users visualize drug concentration profiles,
+ * manage deviations, and get dose correction suggestions.
+ *
+ * @author Andreas Weyer
+ * @license MIT
+ */
+
 import React from 'react';
 
 // Components