Enrich the opentelemetry-jaeger README to contain an explicit warning…

… about its upcoming deprecation and the migration of the Jaeger propagator functionality to a standalone crate

opentelemetry-jaeger/README.md

@@ -12,6 +12,11 @@
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+**WARNING**
+[Jaeger](https://www.jaegertracing.io/) supports the OpenTelemetry Protocol (OTLP) as of [v1.35.0](https://github.com/jaegertracing/jaeger/releases/tag/v1.35.0) and as a result, language specific Jaeger exporters within OpenTelemetry SDKs are [recommended for deprecation by the OpenTelemetry project](https://opentelemetry.io/blog/2022/jaeger-native-otlp/). More information and an example of using OTLP with Jaeger can be found in [Introducing native support for OpenTelemetry in Jaeger](https://medium.com/jaegertracing/introducing-native-support-for-opentelemetry-in-jaeger-eb661be8183c).
+
+The opentelemetry-jaeger crate previously contained both a Jaeger exporter and a Jaeger propagator. To prepare for the deprecation of the Jaeger exporter, the Jaeger propagator implementation has been migrated to [opentelemetry-jaeger-propagator](../opentelemetry-jaeger-propagator/).
+
 ## Overview
 
 [`OpenTelemetry`] is a collection of tools, APIs, and SDKs used to instrument,