Update README.md

Added Blackbox ref

Author: trueangle

README.md

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+* [Blackbox](https://github.com/trueangle/Blackbox) - A lightweight framework that includes a set of architecture tools and approaches for building scalable, fully multiplatform applications (100% shared logic). Streamlines project modularization through the separation into independent parts and provides features like lifecycle-aware components, declarative navigation, and constructor-based DI.  
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 #### Project templates 
 
 * [moko-template](https://github.com/icerockdev/moko-template) - Template project of a Mobile (Android & iOS) Kotlin MultiPlatform project with the MOKO libraries and modularized architecture