Add qri-io default `.github` files

[feep]

Add default community files for qri-io.

• [x] CODE_OF_CONDUCT.md
• [x] SECURITY.md
• [x] SUPPORT.md

blocked

These are holding until non-go repos have the relevant files to override org defaults.

Issue #2.

CONTRIBUTING.md Issue and pull request templates and config.yml

Probably not this: FUNDING.yml

[feep]

Accidentally autoclosed.