Added a linting workflow

.github/workflows/linting.yml

@@ -0,0 +1,16 @@
+name: Documentation
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  check_linter:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: CheckLint
+        uses: overtrue/phplint@8.0
+        with:
+          path: .
+          options: --exclude=*.log

.phplint.yml

@@ -0,0 +1,9 @@
+path: ./
+jobs: 10
+cache: build/phplint.cache
+extensions:
+  - php
+exclude:
+  - vendor
+warning: false
+