Update README.md

Author: jonasjabari

README.md

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 Boost your productivity & easily create reactive web UIs in pure Ruby. Easily extend with pure JavaScript if required. No Opal involved.
 
+**New repo, old git history? This repo was duplicated from `matestack-ui-core` in order to extract Vue.js features into `matestack-ui-vuejs` in Feburary 2022**
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 ## About
 
 `matestack-ui-vuejs` ships all you need to build **reactive** UIs in **pure Ruby** orchestrating prebuilt Vue.js components with a simple Ruby DSL.