Add SECURITY.md

[jpkrohling]

Follow-up from open-telemetry/opentelemetry-specification#990
and open-telemetry/community#401

Signed-off-by: Juraci Paixão Kröhling [email protected]

[bogdandrutu]

Wait for me to enable CLA

[yurishkuro]

• Is there some documentation about the significance of dot-github repository?
• Can we add some README & description to this repository?

[jpkrohling]

There's some info in the issue that was created requesting this repo here: open-telemetry/community#544. More specifically, this doc page: https://docs.github.com/en/free-pro-team@latest/github/building-a-strong-community/creating-a-default-community-health-file

You can add default community health files to the root of a public repository called .github that is owned by an organization or user account.

[bogdandrutu]

Done, easycla is enabled.