Add content from https://github.com/explainers-by-googlers/template

.github/workflows/auto-publish.yml

@@ -0,0 +1,17 @@
+name: CI
+on:
+  pull_request: {}
+  push:
+    branches: [main]
+jobs:
+  main:
+    name: Build, Validate and Deploy
+    runs-on: ubuntu-22.04
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: w3c/spec-prod@v2
+        with:
+          GH_PAGES_BRANCH: gh-pages
+          BUILD_FAIL_ON: warning

.gitignore

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+index.html

.pr-preview.json

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+{
+  "src_file": "index.bs",
+  "type": "bikeshed",
+  "params": {
+    "force": 1
+  }
+}