Add template materials; move explainer into README.md

.github/dependabot.yml

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+# See the documentation at
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+version: 2
+updates:
+  # Update actions used by .github/workflows in this repository.
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    groups:
+      actions-org: # Groups all Github-authored actions into a single PR.
+        patterns: ["actions/*"]

.github/workflows/auto-publish.yml

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+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.txt

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+index.html

index.bs

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+<pre class='metadata'>
+Title: The Additional Windowing Controls API
+Shortname: Additional Windowing Controls
+Level: None
+Status: w3c/UD
+Repository: explainers-by-googlers/additional-windowing-controls
+URL: https://explainers-by-googlers.github.io/additional-windowing-controls
+Editor: Mike Wasserman, Google https://google.com, msw@google.com
+Abstract: Additional APIs for web applications to introspect and control their windows
+Markup Shorthands: markdown yes, css no
+Complain About: accidental-2119 yes, missing-example-ids yes
+Assume Explicit For: yes
+Die On: warning
+WPT Path Prefix: TODO-API-LABEL
+WPT Display: closed
+Include MDN Panels: if possible
+Include Can I Use Panels: yes
+</pre>
+
+Introduction {#intro}
+=====================
+
+For now, see the [explainer]([README.md]).
+
+See [https://garykac.github.io/procspec/](https://garykac.github.io/procspec/),
+[https://dlaliberte.github.io/bikeshed-intro/index.html](https://dlaliberte.github.io/bikeshed-intro/index.html),
+and [https://speced.github.io/bikeshed/](https://speced.github.io/bikeshed/) to get started on your
+specificaton.

pr-preview.json

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