Housekeeping

[dominykas]

Updating according to latest discussions and docs:

• https://github.com/nodejs/package-maintenance/blob/master/Governance.md
• https://github.com/nodejs/package-maintenance/issues/368
• https://github.com/nodejs/package-maintenance/issues/348

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• [x] LICENCE.md from the list approved by the OpenJS Foundation
• [x] CODE_OF_CONDUCT.md referencing the Node.js Code of conduct in the admin repo.
• [x] CONTRIBUTING.md which includes the current version of the Developer Certificate of Origin (DCO) used by the Node.js Project
• [x] An PR template(s) used for all Pull requests which includes the current version of the DCO used by the Node.js Project.
  • via https://github.com/pkgjs/.github/blob/master/.github/PULL_REQUEST_TEMPLATE.md
• [x] A README.md which includes references to the GOVERNANCE.md in the package-maintenance repository as the authoritative governance which applies to the repository.