Add CONTRIBUTING.md (#301)
Add CONTRIBUTING.md (#301)

* Add CONTRIBUTING.md

* updates

* updates

* fix

* Update CONTRIBUTING.md

Co-authored-by: Anuraag Agrawal <bb5e24af042f1d35fa939ac33c42b329ab4b22f8@gmail.com>

Co-authored-by: Anuraag Agrawal <bb5e24af042f1d35fa939ac33c42b329ab4b22f8@gmail.com>
open-telemetry/opentelemetry-java-contrib,open-telemetry/opentelemetry-java-contrib,open-telemetry/opentelemetry-java-contrib