update .gitignore

.gitignore

@@ -3,5 +3,18 @@
 
 .packages
 .pub/
+pubspec.lock
 
 build/
+*.iml
+.idea/
+.vscode/
+
+android/.classpath
+android/.project
+android/.settings/org.eclipse.buildship.core.prefs
+example/android/.project
+example/android/.settings/org.eclipse.buildship.core.prefs
+example/android/app/.classpath
+example/android/app/.project
+example/android/app/.settings/org.eclipse.buildship.core.prefs
\ No newline at end of file

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file