ADD file via upload

CircleToSquareConverter.java

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