Add language templates (Kotlin, Scala, Dart, R, Perl, Lua)

gitignore_generator/templates/languages/dart.gitignore

@@ -0,0 +1,38 @@
+# Files and directories created by pub
+.dart_tool/
+.pub/
+build/
+
+# If you're building an application, you may want to check-in your pubspec.lock
+pubspec.lock
+
+# Directory created by dartdoc
+doc/api/
+
+# IDE - VSCode
+.vscode/*
+!.vscode/extensions.json
+.idea/
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
+
+# OS
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Vim
+*.swp
+*.swo
+*~
+
+# Flutter
+coverage/