Add prettier

.github/workflows/format.yml

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+name: Run Prettier
+
+on:
+  push:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@master
+
+      - name: Run prettier
+        run: |
+          npm install
+          npx prettier **/*.md --write
+
+      - name: Commit changes
+        run: |
+          if [ -n "$(git status --short **/*.md)" ]; then
+            git config --local user.name "Oliver Davies"
+            git config --local user.email "339813+opdavies@users.noreply.github.com"
+            git commit -a -m "Run prettier"
+          fi
+
+      - name: Push changes
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          branch: ${{ github.head_ref }}

.gitignore

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+/node_modules/
+

package-lock.json

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+{
+  "requires": true,
+  "lockfileVersion": 1,
+  "dependencies": {
+    "prettier": {
+      "version": "1.19.1",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-1.19.1.tgz",
+      "integrity": "sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew=="
+    }
+  }
+}

package.json

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+{
+  "dependencies": {
+    "prettier": "^1.19.1"
+  }
+}

prettier.config.js

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+module.exports = {
+  arrowParens: 'avoid',
+  bracketSpacing: false,
+  endOfLine: 'lf',
+  htmlWhitespaceSensitivity: 'css',
+  insertPragma: false,
+  jsxBracketSameLine: false,
+  jsxSingleQuote: false,
+  printWidth: 80,
+  proseWrap: 'always',
+  quoteProps: 'as-needed',
+  requirePragma: false,
+  semi: false,
+  singleQuote: true,
+  tabWidth: 2,
+  trailingComma: 'all',
+  useTabs: false,
+}