Add .gitignore for Spring project files

Spring.gitignore

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+# Compiled class file
+*.class
+
+# Logs
+*.log
+logs/
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Build
+target/
+build/
+
+# 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*
+replay_pid*
+
+# Maven
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+!.mvn/wrapper/maven-wrapper.jar
+
+# Gradle
+.gradle/
+!gradle/wrapper/gradle-wrapper.jar
+
+# IDEs
+.idea/
+*.iml
+out/
+.vscode/
+
+# Eclipse
+.classpath
+.project
+.settings/
+
+# NetBeans
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+# OS
+.DS_Store
+Thumbs.db
+desktop.ini
+
+# Temp
+*.tmp
+*.temp
+
+# Env / secrets
+.env
+.env.local
+.env.*.local