Add mostly empty IsolatedContext specification (#35)

.github/workflows/build.yml

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+name: Build
+on:
+  pull_request: {}
+  push:
+    branches:
+    - main
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: w3c/spec-prod@v2
+      with:
+        TOOLCHAIN: bikeshed
+        SOURCE: isolated-contexts.bs
+        DESTINATION: isolated-contexts.html
+        GH_PAGES_BRANCH: gh-pages
+        BUILD_FAIL_ON: warning

.gitignore

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+/isolated-contexts.html

.pr-preview.json

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

isolated-contexts.bs

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+<pre class='metadata'>
+Title: Isolated Contexts
+Shortname: isolated-contexts
+Level: 1
+Group: wicg
+Status: w3c/CG-DRAFT
+ED: https://wicg.github.io/isolated-web-apps/isolated-contexts
+Repository: https://github.com/WICG/isolated-web-apps
+
+Editor: Robbie McElrath 139758, Google LLC https://google.com, [email protected]
+
+Abstract:
+  This specification defines "isolated contexts", which allows user agent
+  implementers and specification authors to enable certain features only when
+  minimum standards of isolation and integrity are met.
+
+Markup Shorthands: markdown yes
+</pre>
+
+Introduction {#intro}
+=====================
+
+This specification is currently being drafted. In the meantime, please see the
+[Isolated Web Apps Explainer](https://github.com/WICG/isolated-web-apps).