feat: kata/largest-square-inside-a-circle

Author: ParanoidUser

kata/7-kyu/largest-square-inside-a-circle/README.md

@@ -1,3 +1,3 @@
 # [Largest Square Inside A Circle](https://www.codewars.com/kata/largest-square-inside-a-circle "https://www.codewars.com/kata/5887a6fe0cfe64850800161c")
 
-Determine the **area** of the largest square that can fit inside a circle with radius *r*.
+Determine the **area** of the largest square that can fit inside a circle with radius *r*.

kata/7-kyu/largest-square-inside-a-circle/main/Kata.java

@@ -0,0 +1,5 @@
+interface Kata {
+  static int areaLargestSquare(int r) {
+    return 2 * r * r;
+  }
+}

kata/7-kyu/largest-square-inside-a-circle/test/AreaLargestSquareTest.java

@@ -0,0 +1,16 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class AreaLargestSquareTest {
+  @ParameterizedTest
+  @CsvSource(textBlock = """
+      5, 50
+      7, 98
+      15, 450
+      """)
+  void sample(int r, int expected) {
+    assertEquals(expected, Kata.areaLargestSquare(r));
+  }
+}