Untrack files in .gitignore

...lient/.gradle/6.7.1/executionHistory/executionHistory.bin

...ient/.gradle/6.7.1/executionHistory/executionHistory.lock

CheckersClient/.gradle/6.7.1/fileChanges/last-build.bin

CheckersClient/.gradle/6.7.1/fileHashes/fileHashes.bin

CheckersClient/.gradle/6.7.1/fileHashes/fileHashes.lock

...rsClient/.gradle/6.7.1/fileHashes/resourceHashesCache.bin

CheckersClient/.gradle/6.7.1/gc.properties

CheckersClient/.gradle/6.7.1/javaCompile/classAnalysis.bin

CheckersClient/.gradle/6.7.1/javaCompile/jarAnalysis.bin

CheckersClient/.gradle/6.7.1/javaCompile/javaCompile.lock

CheckersClient/.gradle/6.7.1/javaCompile/taskHistory.bin

...Client/.gradle/buildOutputCleanup/buildOutputCleanup.lock

CheckersClient/.gradle/buildOutputCleanup/cache.properties

CheckersClient/.gradle/buildOutputCleanup/outputFiles.bin

CheckersClient/.gradle/checksums/checksums.lock

CheckersClient/.gradle/checksums/md5-checksums.bin

CheckersClient/.gradle/checksums/sha1-checksums.bin

CheckersClient/.gradle/configuration-cache/gc.properties

CheckersClient/.gradle/vcs-1/gc.properties

CheckersClient/.idea/modules/CheckersClient.iml