added git workflow functionality

.github/workflows/pr.yaml

@@ -0,0 +1,67 @@
+on: pull_request
+name: PR Review
+jobs:
+  test-composer-files:
+    name: Validate composer
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: [ '7.4' ]
+        dependency-version: [ prefer-lowest, prefer-stable ]
+    steps:
+      - uses: actions/checkout@master
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: json
+          coverage: none
+          tools: composer:v2
+      # https://github.com/shivammathur/setup-php#cache-composer-dependencies
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+      - name: Validate composer files
+        run: |
+          composer validate --strict composer.json
+          # Check that dependencies resolve.
+          composer update --${{ matrix.dependency-version }} --prefer-dist --no-interaction
+
+  php-check-coding-standards:
+    name: PHP - Check Coding Standards
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: [ '7.4' ]
+        dependency-version: [ prefer-lowest, prefer-stable ]
+    steps:
+      - uses: actions/checkout@master
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: json
+          coverage: none
+          tools: composer:v2
+      # https://github.com/shivammathur/setup-php#cache-composer-dependencies
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+      - name: Install Dependencies
+        run: |
+          composer install --no-interaction --no-progress
+      - name: PHPCS
+        run: |
+          composer coding-standards-check

composer.json

@@ -25,5 +25,10 @@
     "scripts": {
         "coding-standards-check": "phpcs --standard=phpcs.xml.dist",
         "coding-standards-apply": "phpcbf --standard=phpcs.xml.dist"
+    },
+    "config": {
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": true
+        }
     }
 }