feat: kata/largest-square-inside-a-circle (#806)

* docs: kata description

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

---------

Co-authored-by: ParanoidUser <5120290+ParanoidUser@users.noreply.github.com>

Author: github-actions[bot]

kata/7-kyu/index.md

@@ -298,6 +298,7 @@
 - [Largest 5 digit number in a series](largest-5-digit-number-in-a-series "51675d17e0c1bed195000001")
 - [Largest Elements](largest-elements "53d32bea2f2a21f666000256")
 - [Largest pair sum in array](largest-pair-sum-in-array "556196a6091a7e7f58000018")
+- [Largest Square Inside A Circle](largest-square-inside-a-circle "5887a6fe0cfe64850800161c")
 - [Last Survivor](last-survivor "609eee71109f860006c377d1")
 - [Last](last "541629460b198da04e000bb9")
 - [Latin Squares](latin-squares "645fb55ecf8c290031b779ef")

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

@@ -0,0 +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*.

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));
+  }
+}