Update README.md (#91)

Author: nirgur

README.md

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+# IMPORTANT NOTE: This repository is _DEPRECATED_.
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+Descope Vue SDK has been moved to the [descope-js](https://github.com/descope/descope-js/tree/main/packages/sdks/vue-sdk) repoistory.
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+---
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 # Descope Vue SDK
 
 The Descope Vue SDK provides convenient access to the Descope for an application written on top of Vue.