gitignore cleanup and add .DS_Store (helidon-io#518)

Author: barchetta

.gitignore

@@ -1,26 +1,69 @@
-*~
+# 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*
+
+# Maven
 target/
-.idea/
 .m2/
+dependency-reduced-pom.xml
+pom.xml.versionsBackup
+
+# MacOS
+.DS_Store
+profile
+
+# IntelliJ Idea
+.idea/
 *.iws
 *.ipr
 *.iml
 *.releaseBackup
 atlassian-ide-plugin.xml
-user.txt
+
+# Netbeans
 nbactions.xml
 nb-configuration.xml
-node_modules/
-node/
+
+# Eclipse 
+.settings
+.settings/
+.project
+.classpath
+
+# Asciidoctor
+.asciidoctor/
+
+# Vim
 *.swp
+
+# Gradle
 .gradle/
 build/
-.project
-.settings/
+
+# Node.js
+node_modules/
+node/
+
+# Other
+*~
+user.txt