Add multi-platform notice

README.md

@@ -7,6 +7,7 @@ Sparkle is a full-fledged framework, developed for the development of Server-Plu
 
 This framework combines simple and feature-rich tools with under-the-hood rocket science, to enable a new feature-rich architecture, for plugins, to build on.
 
+Multi-Platform support is planned and will be shifted into development soon!
 # 📑 Version
 Many plugins do everything, to be supported on as many versions of Minecraft as possible. If you want to use this framework with this goal in mind, this may not be the right thing for you. This framework is specialized to make the most out of current and coming technology. This is the reason, why we always build on-top the newest (or current newest stable) version, available right now.