Add AV2225: Use deconstruction to simplify variable assignments

_rules/2225.md

@@ -0,0 +1,41 @@
+---
+rule_id: 2225
+rule_category: dotnet-framework-usage
+title: Use deconstruction to simplify variable assignments
+severity: 3
+---
+C# supports deconstructing tuples, records, and any type that defines a `Deconstruct` method. Use this to avoid intermediate variables and make the intent of your code clearer.
+
+Instead of:
+
+```csharp
+public record Point(int X, int Y);
+
+Point point = GetOrigin();
+int x = point.X;
+int y = point.Y;
+```
+
+write:
+
+```csharp
+(int x, int y) = GetOrigin();
+```
+
+Similarly, deconstruct arrays and collections with pattern matching to avoid index-based access:
+
+```csharp
+if (items is [int first, int second, ..])
+{
+	// use first and second directly
+}
+```
+
+**Tip:** Deconstruction also works in `foreach` loops:
+
+```csharp
+foreach ((int key, int value) in dictionary)
+{
+	Console.WriteLine($"{key}: {value}");
+}
+```