Add split-second-stopwatch exercise #2968 #2977

Gradle files added to new practice exercise.

Gradle/wrapper directories and files copied into split-second-stopwatch exercise as requested.

Author: EmmanuelBerkowicz

exercises/practice/split-second-stopwatch/gradle/wrapper/gradle-wrapper.jar

@@ -0,0 +1,6 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists