Add FrameLayoutKit to Layout section

[kennic]

• Project Name: FrameLayoutKit
• Project URL: https://github.com/kennic/FrameLayoutKit
• Project Description: This framework supports complex layouts, including chaining and nesting layout with simple and intuitive operand & DSL syntax.
• Why it should be added to awesome-swift:
• [x ] At least 15 stars (GitHub project)
• [x] Support Swift 5
• [x] Updated contents.json instead of README
• [x] Lib is fully open sourced, written in Swift and not a wrapper over compiled lib
• [x] Description does not say "written in Swift" or variant 🤓