If this repo is meant to contain all the guidelines to edit specs, then spec/group repositories should refer to it.
The best way to do so is to add a CONTRIBUTING.md file in each repository as it adds a disclaimer note every time someone opens an issue or a pull request.
To ease with this process, this repository should contain a template of such a file to include in other repositories. It should be kept super simple because it is unlikely to be updated in repositories using it, so best to just include a link to this repo.
Here's what the Web NFC Community Group is using.CONTRIBUTING.md and LICENSE.md. That Community Group doesn't have any software, just specs and other documents.
If this repo is meant to contain all the guidelines to edit specs, then spec/group repositories should refer to it. The best way to do so is to add a
CONTRIBUTING.md
file in each repository as it adds a disclaimer note every time someone opens an issue or a pull request. To ease with this process, this repository should contain a template of such a file to include in other repositories. It should be kept super simple because it is unlikely to be updated in repositories using it, so best to just include a link to this repo.