reorganize project files

Android/.gradle/4.9/fileChanges/last-build.bin

Android/.gradle/4.9/fileHashes/fileHashes.bin

Android/.gradle/4.9/fileHashes/fileHashes.lock

Android/.gradle/4.9/taskHistory/taskHistory.bin

Android/.gradle/4.9/taskHistory/taskHistory.lock

.../7.0.2/dependencies-accessors/dependencies-accessors.lock

Android/.gradle/7.0.2/dependencies-accessors/gc.properties

Android/.gradle/7.0.2/fileChanges/last-build.bin

Android/.gradle/7.0.2/fileHashes/fileHashes.bin

Android/.gradle/7.0.2/fileHashes/fileHashes.lock

Android/.gradle/7.0.2/gc.properties

Android/.gradle/buildOutputCleanup/buildOutputCleanup.lock

Android/.gradle/buildOutputCleanup/cache.properties

Android/.gradle/buildOutputCleanup/outputFiles.bin

Android/.gradle/checksums/checksums.lock

Android/.gradle/checksums/md5-checksums.bin

Android/.gradle/checksums/sha1-checksums.bin

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

Android/.gradle/vcsWorkingDirs/gc.properties

Android/.idea/.gitignore