feat: add WICG files.

.pr-preview.json

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

CONTRIBUTING.md

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+# Alternate Loading Modes
+
+This repository is being used for work in the W3C Alternate Loading Modes, governed by the [W3C Community License
+Agreement (CLA)](http://www.w3.org/community/about/agreements/cla/). To make substantive contributions,
+you must join the CG.
+
+If you are not the sole contributor to a contribution (pull request), please identify all
+contributors in the pull request comment.
+
+To add a contributor (other than yourself, that's automatic), mark them one per line as follows:
+
+```
++@github_username
+```
+
+If you added a contributor by mistake, you can remove them in a comment with:
+
+```
+-@github_username
+```
+
+If you are making a pull request on behalf of someone else but you had no part in designing the
+feature, you can remove yourself with the above syntax.

LICENSE.md

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+All Reports in this Repository are licensed by Contributors under the 
+[W3C Software and Document License](http://www.w3.org/Consortium/Legal/2015/copyright-software-and-document).
+Contributions to Specifications are made under the [W3C CLA](https://www.w3.org/community/about/agreements/cla/).

README.md

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+# Alternate Loading Modes
+
+This is the repository for Alternate Loading Modes. You're welcome to
+[contribute](CONTRIBUTING.md)!

explainer.md

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+## Explainer
+
+### Examples

index.bs

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+<pre class='metadata'>
+Title: Alternate Loading Modes
+Shortname: alternate-loading-modes
+Level: 1
+Status: CG-DRAFT
+Group: WICG
+Repository: WICG/alternate-loading-modes
+URL: http://example.com/url-this-spec-will-live-at
+Editor: Jeremy Roman, Google https://www.google.com/, [email protected]
+!Tests: <a href=https://github.com/w3c/web-platform-tests/tree/master/alternate-loading-modes>web-platform-tests alternate-loading-modes/</a> (<a href=https://github.com/w3c/web-platform-tests/labels/alternate-loading-modes>ongoing work</a>)
+Abstract: A short description of your spec, one or two sentences.
+</pre>
+
+Introduction {#intro}
+=====================
+
+See https://github.com/tabatkins/bikeshed to get started.