Project templates for iOS and Android

What does this MR do?

Adds new project templates for iOS and Android. We are unfortunately not able to use an Apple logo so we're using the GitLab logo in place.

• Templates should be loaded at: https://gitlab.com/gitlab-org/project-templates/android and https://gitlab.com/gitlab-org/project-templates/iosswift

Note: See https://gitlab.com/gitlab-org/gitlab-ce/issues/46043 for details on how to vendor a project.

• add iOS project .tar.gz
• [-] add iOS icon
• add Android icon

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/57882

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer