Add spec template, LICENSE and CONTRIBUTING

CONTRIBUTING.md

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+# W3C Machine Learning for the Web Community Group
+
+This repository is being used for work in the W3C Machine Learning for the Web Community Group, governed by the [W3C Community License Agreement (CLA)](https://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](https://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/).
+
+Contributions to Test Suites are made under the
+[W3C 3-clause BSD License](https://www.w3.org/Consortium/Legal/2008/03-bsd-license.html)

README.md

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+Web Neural Network API
+=======
+
+This repository hosts the [Web Neural Network API](https://webmachinelearning.github.io/webnn/)
+being worked on in the 
+[Machine Learning for the Web Community Group](https://www.w3.org/community/webmachinelearning/).

index.bs

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+<pre class='metadata'>
+Title: Web Neural Network API
+Shortname: webnn
+Level: 1
+Status: w3c/CG-DRAFT
+Group: webml
+URL: https://webmachinelearning.github.io/webnn/
+Editor: Your Name, Your Company http://example.com/your-company, your-email@example.com, http://example.com/your-personal-website
+Abstract: A dedicated API for neural network inference hardware acceleration.
+</pre>
+
+Introduction {#intro}
+=====================
+
+Introduction here.
+
+Use cases {#usecases}
+=====================
+
+Use cases here.
+