Create SECURITY.md

[Top-Chief]

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Progress

• [ ] Commit message must refer to an issue
• [ ] Change must be properly reviewed (1 review required, with at least 1 Committer)

Errors

 ⚠️ OCA signatory status must be verified  ⚠️ The pull request body must not be empty.

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jmc.git pull/560/head:pull/560
$ git checkout pull/560

Update a local copy of the PR:
$ git checkout pull/560
$ git pull https://git.openjdk.org/jmc.git pull/560/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 560

View PR using the GUI difftool:
$ git pr show -t 560

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jmc/pull/560.diff

[bridgekeeper[bot]]

Hi @Top-Chief, welcome to this OpenJDK project and thanks for contributing!

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[openjdk[bot]]

❗ This change is not yet ready to be integrated. See the Progress checklist in the description for automated requirements.