Fix iOS example app build (#163)

* Add missing files to vcs

* Fix .gitignore

Author: solid-yuriiprykhodko

flutter_vlc_player/example/.gitignore

@@ -115,4 +115,4 @@ app.*.symbols
 !**/ios/**/default.perspectivev3
 !/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
 !/dev/ci/**/Gemfile.lock
-/example/ios/Runner.xcodeproj/project.pbxproj
+!/example/ios/Runner.xcodeproj/project.pbxproj