Merge pull request #193 from open-o11y/add-badge

Add CI Badge

Author: Ignacio Bonafonte

README.md

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 # opentelemetry-swift
 
+[![CI](https://github.com/open-telemetry/opentelemetry-swift/actions/workflows/BuildAndTest.yml/badge.svg)](https://github.com/open-telemetry/opentelemetry-swift/actions/workflows/BuildAndTest.yml?query=branch%3Amain+)
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 A swift [OpenTelemetry](https://opentelemetry.io/) client
 
 ## Installation