Add skeleton specification

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+<pre class="metadata">
+Shortname: webxr-hand-input
+Title: WebXR Hand Input Module - Level 1
+Group: immersivewebwg
+Status: ED
+ED: https://immersive-web.github.io/webxr-hands-input/
+Repository: immersive-web/webxr-hands-input
+Level: 1
+Mailing List Archives: https://lists.w3.org/Archives/Public/public-immersive-web/
+
+!Participate: <a href="https://github.com/immersive-web/webxr-hands-input/issues/new">File an issue</a> (<a href="https://github.com/immersive-web/webxr-hands-input/issues">open issues</a>)
+!Participate: <a href="https://lists.w3.org/Archives/Public/public-immersive-web/">Mailing list archive</a>
+!Participate: <a href="irc://irc.w3.org:6665/">W3C's #immersive-web IRC</a>
+
+Editor: Manish Goregaokar 109489, Mozilla http://mozilla.org/, [email protected]
+
+Abstract: The WebXR Hand Input module expands the <a href="https://www.w3.org/TR/webxr/">WebXR Device API</a> with the functionality to track articulated hand poses.
+
+Warning: custom
+Custom Warning Title: Unstable API
+Custom Warning Text:
+  <b>The API represented in this document is under development and may change at any time.</b>
+  <p>For additional context on the use of this API please reference the <a href="https://github.com/immersive-web/webxr-hands-input/blob/master/explainer.md">Hand Input Module Explainer</a>.</p>
+Status Text: This WebXR Augmented Reality Module is designed as a module to be implemented in addition to <a href="https://www.w3.org/TR/webxr/">WebXR Device API</a>, and is originally included in WebXR Device API which was divided into core and modules. 
+</pre>
+
+
+<link rel="icon" type="image/png" sizes="32x32" href="favicon-32x32.png">
+<link rel="icon" type="image/png" sizes="96x96" href="favicon-96x96.png">
+
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+</style>
+
+
+<pre class="link-defaults">
+spec: webxr-1;
+    type: dfn; text: xr device; for: /
+    type: dfn; text: native origin
+    type: dfn; text: feature descriptor
+</pre>
+
+<pre class="anchors">
+</pre>
+
+
+Introduction {#intro}
+============
+
+<section class="non-normative">
+
+</section>
+
+WebXR Device API Integration {#webxr-device-api-integration}
+==============
+
+XRSessionMode {#xrsessionmode-enum}
+-------------
+
+
+Privacy & Security Considerations {#privacy-security}
+=================================
+
+TODO
+
+