message: doc: Mention repo split in the READMEs
diff: @@ -84,6 +84,26 @@ To contribute a patch, the workflow is as follows:
  1. Create topic branch
  1. Commit patches
  +For GUI-related issues or pull requests, the https://github.com/bitcoin-core/gui repository should be used.
  +For all other issues and pull requests, the https://github.com/bitcoin/bitcoin node repository should be used.
  +
  +The master branch for all monotree repositories is identical.
  +
  +As a rule of thumb, everything that only modifies `src/qt` is a GUI-only pull
  +request. However:
  +
  +* For global refactoring or other transversal changes the node repository
  + should be used.
  +* For GUI-related build system changes, the node repository should be used
  + because the change needs review by the build systems reviewers.
  +* Changes in `src/interfaces` need to go to the node repository because they
  + might affect other components like the wallet.
  +
  +For large GUI changes that include build system and interface changes, it is
  +recommended to first open a pull request against the GUI repository. When there
  +is agreement to proceed with the changes, a pull request with the build system
  +and interfaces changes can be submitted to the node repository.
  +
  The project coding conventions in the [developer notes](doc/developer-notes.md)
  must be followed.
  