Add AV2225: Use deconstruction to simplify variable assignments

_rules/2225.md

@@ -0,0 +1,31 @@
+---
+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:
+
+	var point = GetOrigin();
+	var x = point.X;
+	var y = point.Y;
+
+write:
+
+	var (x, y) = GetOrigin();
+
+Similarly, deconstruct arrays and collections with pattern matching to avoid index-based access:
+
+	if (items is [var first, var second, ..])
+	{
+		// use first and second directly
+	}
+
+**Tip:** Deconstruction also works in `foreach` loops:
+
+	foreach (var (key, value) in dictionary)
+	{
+		Console.WriteLine($"{key}: {value}");
+	}