Add SECURITY.md

[TravisCarden]

• Part of Create a security policy #79.

Context/background: #79 (comment)

[greggles]

I'm so glad you're working on this. Seems like a good start.

Some thoughts:

• Maybe this should be linked from the README like "See the security guide for how to report security issues"?
• We can clarify here that the Drupal Security process is a "hall of fame" system and can issue CVEs.
• I tend not to use all caps in docs and prefer a "please" but I think please is kinda controversial. Maybe an emoji could help?

Something like this, perhaps:

• 🛑 Please do not report vulnerabilities in this project in public Github issues.
• ✅ Please report via the Drupal Security Team's reporting queue.

Also, should issues for this be reported to the core component? Normally if this had a project page on drupal.org there would be a project to assign it to on security.drupal.org but...without that where should this go? Wherever it is we can link directly to that reporting page in addition to the policy pages.

[xjm]

Well, Drupal's content guidelines advise against the use of the word "please" in d.o content and prohibit it entirely in Drupal's UI text, so I would leave out the "please". Fewer words is also generally preferable.

[greggles]

I guess that is this style guide? I see that advice, thanks. I also see the word please in a bunch of spots on that page, interestingly.

So, "please" is out. Noted.

[catch56]

I think this is a good start, we could improve it later if/when we need to.

[TravisCarden]

Alright. We'll do that then.