Added documentation

app/MindWork AI Studio/Settings/Provider.cs

@@ -2,4 +2,25 @@ using AIStudio.Provider;
 
 namespace AIStudio.Settings;
 
-public readonly record struct Provider(string Id, string InstanceName, Providers UsedProvider);
+/// <summary>
+/// Data model for configured providers.
+/// </summary>
+/// <param name="Id">The provider's ID.</param>
+/// <param name="InstanceName">The provider's instance name. Useful for multiple instances of the same provider, e.g., to distinguish between different OpenAI API keys.</param>
+/// <param name="UsedProvider">The provider used.</param>
+public readonly record struct Provider(string Id, string InstanceName, Providers UsedProvider)
+{
+    #region Overrides of ValueType
+
+    /// <summary>
+    /// Returns a string that represents the current provider in a human-readable format.
+    /// We use this to display the provider in the chat UI.
+    /// </summary>
+    /// <returns>A string that represents the current provider in a human-readable format.</returns>
+    public override string ToString()
+    {
+        return $"{this.InstanceName} ({this.UsedProvider.ToName()})";
+    }
+
+    #endregion
+}