Updated readme for phpcs usage, aligned gh action workflows

.github/workflows/analyse-php.yml

@@ -0,0 +1,34 @@
+name: analyse-php
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    if: ${{ github.ref != 'refs/heads/l10n_development' }}
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: 8.1
+        extensions: gd, mbstring, json, curl, xml, mysql, ldap
+
+    - name: Get Composer Cache Directory
+      id: composer-cache
+      run: |
+        echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+    - name: Cache composer packages
+      uses: actions/cache@v2
+      with:
+        path: ${{ steps.composer-cache.outputs.dir }}
+        key: ${{ runner.os }}-composer-8.1
+        restore-keys: ${{ runner.os }}-composer-
+
+    - name: Install composer dependencies
+      run: composer install --prefer-dist --no-interaction --ansi
+
+    - name: Run static analysis check
+      run: composer check-static