Comply with wpcs

.gitattributes

@@ -1,3 +1,4 @@
 .gitattributes export-ignore
 .github export-ignore
-.gitignore export-ignore
+.gitignore export-ignore
+phpcs.xml.dist export-ignore

.github/workflows/wpcs.yml

@@ -0,0 +1,26 @@
+name: WPCS checks.
+
+on: [pull_request, push]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  phpcs:
+      name: WPCS
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v4
+        - name: WPCS checks
+          uses: 10up/wpcs-action@stable
+          with:
+            use_local_config: 'true'
+            enable_warnings: 'true'
+            extra_args: '-q -n --report-json=./phpcs.json'
+        - name: Update summary
+          run: |
+            npm i -g github:10up/phpcs-json-to-md
+            phpcs-json-to-md --path ./phpcs.json --output ./phpcs.md
+            cat phpcs.md >> $GITHUB_STEP_SUMMARY
+          if: always()

README.md

@@ -2,6 +2,8 @@
 
 # ClassicPress Directory integrator.
 
+[![ClassicPress Directory Coding Standard checks.](https://github.com/ClassicPress/classicpress-directory-integration/actions/workflows/cpcs.yml/badge.svg)](https://github.com/ClassicPress/classicpress-directory-integration/actions/workflows/cpcs.yml)[![WPCS checks.](https://github.com/ClassicPress/classicpress-directory-integration/actions/workflows/wpcs.yml/badge.svg)](https://github.com/ClassicPress/classicpress-directory-integration/actions/workflows/wpcs.yml)
+
 ## Features
 
 - Plugins and themes from [ClassicPress Directory](https://directory.classicpress.net/) now can update as WP.org plugins.