Update gitignore file.

Author: j0j00

.gitignore

@@ -1,9 +1,25 @@
-.DS_Store
-.dart_tool/
+# See https://www.dartlang.org/guides/libraries/private-files
 
+# Files and directories created by pub
+.dart_tool/
 .packages
 .pub/
+build/
+# If you're building an application, you may want to check-in your pubspec.lock
 pubspec.lock
 
-build/
-/lib/generated
+# Directory created by dartdoc
+# If you don't generate documentation locally you can remove this line.
+doc/api/
+
+# Extras
+lib/generated/i18n.dart
+.DS_Store
+.gradle
+
+# Log files
+*.log
+
+# ide
+.idea/
+*.iml