Add explanations to the runtime attach readme (#524)
Add explanations to the runtime attach readme (#524)

Co-authored-by: Mateusz Rzeszutek <f50469d556da6b64075fd697f4b31e18dd5b783a@splunk.com>
open-telemetry/opentelemetry-java-contrib,open-telemetry/opentelemetry-java-contrib,open-telemetry/opentelemetry-java-contrib