Add issue templates and reusable PHPUnit workflow.

ISSUE_TEMPLATE/BUG_REPORT.md

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+---
+name: "\U0001F41B Bug Report"
+about: "Something isn't working as expected"
+title: ''
+labels: 'i: bug'
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Environment (please complete the following information):**
+ - Device: [e.g. Desktop, iPhone...]
+ - OS: [e.g. Unbuntu, iOS...]
+ - Browser [e.g. Chrome, Safari...]
+ - Version [e.g. 22]
+
+**Additional context, screenshots**
+Add any other context about the problem here.
+If applicable, add screenshots to help explain your problem.

ISSUE_TEMPLATE/FEATURE_REQUEST.md

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+---
+name: "\U0001F195 Feature Request"
+about: "I have a suggestion for missing functionality or improvements"
+title: ''
+labels: 'i: enhancement'
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context, screenshots**
+Add any other context or screenshots about the feature request here.

README.md

@@ -1 +1,4 @@
-# .github
+polylang/.github
+===================
+
+🌐 Centralized health files for all repositories. Contains mostly shared workflows and templates.

workflows/reusable-integration-and-unit-tests.yml

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+name: Integration and Unit Tests
+
+# Cancels all previous workflow runs for the same branch that have not yet completed.
+concurrency:
+  # The concurrency group contains the workflow name and the branch name.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  testing:
+    name: WP ${{ matrix.wordpress-version }} + PHP ${{ matrix.php-version }} + MS ${{ matrix.is-multisite }} + Allowed to fail ${{ matrix.allow-failure }}
+
+    runs-on: ubuntu-latest
+
+    services:
+      mysql:
+        image: mariadb:11.2
+        ports:
+          - '3306:3306'
+        env:
+          MYSQL_ROOT_PASSWORD: wordpress
+          MARIADB_INITDB_SKIP_TZINFO: 1
+          MYSQL_USER: wordpress
+          MYSQL_PASSWORD: wordpress
+          MYSQL_DATABASE: wordpress_test
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - wordpress-version: '6.2.x'
+            php-version: '7.4'
+            is-multisite: 0
+            allow-failure: false
+          - wordpress-version: 'latest'
+            php-version: '7.2'
+            is-multisite: 0
+            allow-failure: false
+          - wordpress-version: 'latest'
+            php-version: '8.1'
+            is-multisite: 0
+            allow-failure: false
+          - wordpress-version: 'latest'
+            php-version: '8.0'
+            is-multisite: 1
+            allow-failure: false
+          - wordpress-version: 'nightly'
+            php-version: '7.2'
+            is-multisite: 0
+            allow-failure: true
+          - wordpress-version: 'nightly'
+            php-version: '8.3'
+            is-multisite: 0
+            allow-failure: true
+
+    env:
+      WP_MULTISITE: ${{ matrix.is-multisite }}
+
+    steps:
+      - name: Check out the source code
+        uses: actions/checkout@v3
+
+      - name: Run PHPUnit tests
+        uses: polylang/actions/phpunit@main
+        with:
+          php-version: ${{ matrix.php-version }}
+          wordpress-version: ${{ matrix.wordpress-version }}