docs: kata description

kata/8-kyu/find-out-whether-the-shape-is-a-cube/README.md

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+# [Find out whether the shape is a cube](https://www.codewars.com/kata/find-out-whether-the-shape-is-a-cube "https://www.codewars.com/kata/58d248c7012397a81800005c")
+
+To find the volume (centimeters cubed) of a cuboid you use the formula:
+
+```volume = Length LICENSE build.gradle.kts docs gradle gradle.properties gradlew gradlew.bat kata settings.gradle.kts Width LICENSE build.gradle.kts docs gradle gradle.properties gradlew gradlew.bat kata settings.gradle.kts Height```
+
+But someone forgot to use proper record keeping, so we only have the volume, and the length of a single side!
+
+It's up to you to find out whether the cuboid has equal sides (= is a cube).
+
+Return `true` if the cuboid could have equal sides, return `false` otherwise.
+
+Return `false` for invalid numbers too (e.g volume or side is less than or equal to 0).
+
+Note: side will be an integer