add a README

... correct the module namespace in code example

processor/baggage/README.md

@@ -0,0 +1,68 @@
+# Baggage Span Processor
+
+This is an OpenTelemetry [span processor](https://opentelemetry.io/docs/specs/otel/trace/sdk/#span-processor) that reads key/values stored in [Baggage](https://opentelemetry.io/docs/specs/otel/baggage/api/) in the starting span's parent context and adds them as attributes to the span.
+
+## How do I get started?
+
+Install the gem using:
+
+```shell
+gem install opentelemetry-processor-baggage
+```
+
+Or, if you use [bundler][bundler-home], include `opentelemetry-processor-baggage` to your `Gemfile`.
+
+### Version Compatibility
+
+* OpenTelemetry API v1.0+
+
+## Usage
+
+To install the instrumentation, add the gem to your Gemfile:
+
+```ruby
+gem 'opentelemetry-processor-baggage'
+```
+
+Then add the processor to an SDK's configuration:
+
+```ruby
+require 'rubygems'
+require 'bundler/setup'
+
+Bundler.require
+
+OpenTelemetry::SDK.configure do |c|
+  # Add the BaggageSpanProcessor to the collection of span processors
+  c.add_span_processor(OpenTelemetry::Processor::Baggage::BaggageSpanProcessor.new)
+
+  # Because the span processor list is no longer empty, the SDK will not use the
+  # values in OTEL_TRACES_EXPORTER to instantiate exporters.
+  # You'll need to declare your own here in the configure block.
+  #
+  # These lines setup the default: a batching OTLP exporter.
+  c.add_span_processor(
+    # these constructors without arguments will pull config from the environment
+    OpenTelemetry::SDK::Trace::Export::BatchSpanProcessor.new(
+      OpenTelemetry::Exporter::OTLP::Exporter.new()
+    )
+  )
+end
+```
+
+## How can I get involved?
+
+The `opentelemetry-processor-baggage` gem source is [on github][repo-github], along with related gems including `opentelemetry-api` and `opentelemetry-sdk`.
+
+The OpenTelemetry Ruby gems are maintained by the OpenTelemetry-Ruby special interest group (SIG). You can get involved by joining us in [GitHub Discussions][discussions-url] or attending our weekly meeting. See the [meeting calendar][community-meetings] for dates and times. For more information on this and other language SIGs, see the OpenTelemetry [community page][ruby-sig].
+
+## License
+
+The `opentelemetry-instrumentation-sinatra` gem is distributed under the Apache 2.0 license. See [LICENSE][license-github] for more information.
+
+[bundler-home]: https://bundler.io
+[repo-github]: https://github.com/open-telemetry/opentelemetry-ruby-contrib
+[license-github]: https://github.com/open-telemetry/opentelemetry-ruby-contrib/blob/main/LICENSE
+[ruby-sig]: https://github.com/open-telemetry/community#ruby-sig
+[community-meetings]: https://github.com/open-telemetry/community#community-meetings
+[discussions-url]: https://github.com/open-telemetry/opentelemetry-ruby/discussions

processor/baggage/lib/opentelemetry/processor/baggage/baggage_span_processor.rb

@@ -26,7 +26,7 @@ module Baggage
       # @example
       #   OpenTelemetry::SDK.configure do |c|
       #     # Add the BaggageSpanProcessor to the collection of span processors
-      #     c.add_span_processor(Honeycomb::OpenTelemetry::Trace::BaggageSpanProcessor.new)
+      #     c.add_span_processor(OpenTelemetry::Processor::Baggage::BaggageSpanProcessor.new)
       #
       #     # Because the span processor list is no longer empty, the SDK will not use the
       #     # values in OTEL_TRACES_EXPORTER to instantiate exporters.