feat(docs): added openbase.io badge

Author: lubber-de

README.md

@@ -6,6 +6,7 @@ A community fork of the popular Semantic-UI framework.
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+[![Rate on Openbase](https://badges.openbase.io/js/rating/fomantic-ui.svg)](https://openbase.io/js/fomantic-ui?utm_source=embedded&utm_medium=badge&utm_campaign=rate-badge)
 
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