Create SECURITY.md

[Silvrbckw]

Updated Security

[welcome]

Thank you for submitting this PR!
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• The context for this PR is clear, with relevant discussion, decisions
  and stakeholders linked/mentioned.

• Your contribution itself is clear (code comments, self-review for the
  rest) and in its best form. Follow the code contribution
  guidelines
  if they apply.

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We are very grateful for your contribution!

[Silvrbckw]

Is a security policy needed? Hope this helps.

[whizzzkid]

Thanks for creating this PR @Silvrbckw, did you mean to create this as a template or would like to fill the security policy in as well?

There is a public policy in place: https://github.com/ipfs/community/security/policy does this mean to replicate that?

[SgtPooki]

Modified with copy from Kubo's policy: ipfs/kubo#9062