add github workflow

Author: Tom Pearson

.github/workflows/pa11y.yml

@@ -0,0 +1,19 @@
+name: pa11y
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+  workflow_dispatch:
+
+jobs:
+  pa11y:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js 14
+        uses: actions/setup-node@v1
+        with:
+          node-version: 14
+      - name: Run pa11y
+        run: |
+          npm i
+          npm test

README.md

@@ -1,3 +1,5 @@
 This repo exist to demonstrate an approach to accesibility testing using Github actions and [Pa11y]()
 
-HTML based on [HTML 5 boilerplate h5bp](https://html5boilerplate.com/)`
+HTML based on [HTML 5 boilerplate h5bp](https://html5boilerplate.com/)`
+
+`npm run test`