Add Banuba Video Editor SDK

[GlebPBanuba]

• Video Editor:
• https://github.com/Banuba/ve-sdk-ios-integration-sample:
• Video Editor SDK (Android & iOS) is a fully-functional video editor that can be integrated into an app in minutes, designed to create exciting social media content with a wide range of effects and filters for professional-quality videos on phones:
• Very powerful library for integrating video editing feature in any iOS app:
• [x] At least 15 stars (GitHub project)
• [ ] Support Swift 5
• [x] Updated contents.json instead of README
• [ ] Lib is fully open sourced, written in Swift and not a wrapper over compiled lib
• [ ] Description does not say "written in Swift" or variant 🤓