Added .gitignore

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/java,maven,netbeans,windows,macos,linux
+# Edit at https://www.toptal.com/developers/gitignore?templates=java,maven,netbeans,windows,macos,linux
+### Java ###
+# Compiled class file
+*.class
+# Log file
+*.log
+# BlueJ files
+*.ctxt
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+### Linux ###
+*~
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+# KDE directory preferences
+.directory
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+# Icon must end with two \r
+Icon
+# Thumbnails
+._*
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+### Maven ###
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+# https://github.com/takari/maven-wrapper#usage-without-binary-jar
+.mvn/wrapper/maven-wrapper.jar
+### NetBeans ###
+**/nbproject/private/
+**/nbproject/Makefile-*.mk
+**/nbproject/Package-*.bash
+build/
+nbbuild/
+dist/
+nbdist/
+.nb-gradle/
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+# Dump file
+*.stackdump
+# Folder config file
+[Dd]esktop.ini
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+# Windows shortcuts
+*.lnk
+# End of https://www.toptal.com/developers/gitignore/api/java,maven,netbeans,windows,macos,linux