[w3c/manifest] Create SECURITY.md (PR #1117)

Closes #???

This change (choose at least one, delete ones that don't apply):

* Breaks existing normative behavior (please add label "breaking")
* Adds new normative requirements
* Adds new normative recommendations or optional items
* Makes editorial changes (changes informative sections, or changes normative sections without changing behavior)
* Is a "chore" (metadata, formatting, fixing warnings, etc).

Implementation commitment (delete if not making normative changes):

* [ ] WebKit (https://bugs.webkit.org)
* [ ] Chromium (https://bugs.chromium.org/)
* [ ] Gecko (http://bugzilla.mozilla.org)

If change is normative, and it adds or changes a member:

* [ ] [updated JSON schema](https://github.com/SchemaStore/schemastore/blob/master/src/schemas/json/web-manifest.json)

Commit message:

(Fill in. If making normative changes, describe exactly what the behavioral
difference will be.)

Person merging, please make sure that commits are squashed with one of the following as a commit message prefix:

* chore:
* editorial:
* BREAKING CHANGE:
* And use none if it's a normative change

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1117

-- Commit Summary --

  * Create SECURITY.md

-- File Changes --

    A SECURITY.md (21)

-- Patch Links --

https://github.com/w3c/manifest/pull/1117.patch
https://github.com/w3c/manifest/pull/1117.diff

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