Publish Project Charter on website or GitHub

[Relequestual]

Requiremnet for OpenJS Foundation onboarding.
Template provided: https://github.com/openjs-foundation/cross-project-council/blob/HEAD/PROJECT_CHARTER_TEMPLATE.md

While we are no longer a project under the OpenJS Foundation, we still feel it important to have a charter. This helps keep us focused and enables newcomers to have a clear understanding of our objectives and boundaries. The template is still useful.

[Relequestual]

Discussion Started: #286

[github-actions]

Hello! 👋

This issue has been automatically marked as stale due to inactivity 😴

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