ADD file via upload

SquareToCircleConverter.java

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+public class SquareToCircleConverter implements ShapeConverter<Square, Circle> {
+    @Override
+    public Circle convert(Square source) {
+        if (!canConvert(source)) {
+            throw new IllegalArgumentException("Cannot convert null square");
+        }
+        
+        // Calculate radius of circle with equal area to the square
+        double squareArea = source.calculateArea();
+        double circleRadius = Math.sqrt(squareArea / Math.PI);
+        
+        // Create circle with the same color as the square
+        return new Circle(circleRadius, source.getColor());
+    }
+    
+    @Override
+    public boolean canConvert(Square source) {
+        return source != null && source.getSide() > 0;
+    }
+    
+    @Override
+    public String getConversionDescription() {
+        return "Converts a square to a circle with equal area and same color";
+    }
+}