add codeowners

.github/CODEOWNERS

@@ -0,0 +1,12 @@
+# These owners will be the default owners for everything in
+# the repo. Unless a later match takes precedence,
+# these will always be requested as reviewer when someone
+# opens a pull request.
+*       @cjrace @sarahmwong
+
+
+# Keep individual file lines at the end so they can take
+# precedence over more generic rules above
+# Putting Cam as owner so that if there's any changes to
+# our link text list, he can update EES to match
+data-raw/bad_link_text.R @cjrace

.github/CONTRIBUTING.md

@@ -16,6 +16,10 @@ Once a pull request is reviewed and ready to be merged in, all commits in the PR
 
 The `master` branch acts as the development version of the package for users, releases of stable package versions to CRAN will be made by the maintainers when they feel it is appropriate to do so.
 
+### Code owners
+
+We make use of [GitHub's CODEOWNERS file](https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners) to set default reviewers for the repo and for specific parts of the code.
+
 ## CSS changes
 
 All changes made to the main `inst/www/css/govuk-frontend-norem.css` file should be logged in the `css_changes.md` file, this way they can easily be reapplied whenever the CSS assests from GOV.UK are updated.