Add Marketplace Version Badge

README.md

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 # ![Archie the Debugger Owl](./docs/brand/archie-small.png)  RxJS Debugger for Visual Studio Code
 
+[![Click to visit marketplace](https://vsmarketplacebadge.apphb.com/version-short/manuelalabor.rxjs-debugging-for-vs-code.svg)](https://marketplace.visualstudio.com/items?itemName=manuelalabor.rxjs-debugging-for-vs-code)
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 > Never, ever use `tap(console.log)` again.
 
 Add non-intrusive debugging capabilities for [RxJS](https://rxjs.dev/) applications to [Visual Studio Code](https://code.visualstudio.com/).