Add default community files

[zdylag]

There are some basic files (contributing, support, etc) that seem useful to have added.

Since these are relatively straight-forward and increase our ability to recruit new members, I feel they should be prioritized.

Github help guide: https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/creating-a-default-community-health-file

[Matt-Hurd]

I suck at these, anyone can pick this one up :)

[FrozenSake]

Looks like the list of community files is:

• CODE_OF_CONDUCT.md
• CONTRIBUTING.md (done)
• FUNDING.yml (Do we need it yet?)
• issue templates (done)
• pr templates
• config.yml
• SECURITY.md
• SUPPORT.md

of those, it's not clear we need them all, and would we want to set up the defaults for the whole organization? (by making the .github repository under the org, the defaults will get displayed until a repo declares a specific)