Added .gitignore file

.idea/.gitignore

-# Default ignored files
-/shelf/
-/workspace.xml
+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+.idea/
+*.iml
+*.iws
+
+### Maven & Gradle ###
+target/
+build/
+
+# Logs and temporary files
+*.log
+*.tmp
+*.bak
+*.swp
+
+# Compiled files
+*.class
+
+# Other project-specific files
+.gradle/
+*.jar
+*.war
+*.ear
+
+# Windows OS generated files
+Thumbs.db
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file