Firebase Cloud database stuff

.gradle/7.5/checksums/checksums.lock

.gradle/7.5/executionHistory/executionHistory.bin

.gradle/7.5/executionHistory/executionHistory.lock

.gradle/7.5/fileHashes/fileHashes.bin

.gradle/7.5/fileHashes/fileHashes.lock

.gradle/7.5/fileHashes/resourceHashesCache.bin

.gradle/buildOutputCleanup/buildOutputCleanup.lock

.gradle/buildOutputCleanup/outputFiles.bin

.gradle/file-system.probe

.idea/deploymentTargetDropDown.xml

.idea/jarRepositories.xml

app/build.gradle

app/google-services.json

app/src/main/AndroidManifest.xml

app/src/main/java/com/example/game2d/FirebaseActivity.java

...src/main/java/com/example/game2d/LeaderboardActivity.java

app/src/main/java/com/example/game2d/NameResultActivity.java

app/src/main/res/layout/activity_leaderboard.xml

app/src/main/res/layout/activity_name_result.xml

app/src/main/res/layout/activity_username.xml