Add CONTRIBUTING.md, LICENSE.md, README.md

Author: prushforth

CONTRIBUTING.md

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+# Contributing to MapML
+
+This repository is being used for work in the [W3C Maps For HTML Community Group](http://www.w3.org/community/maps4html/), 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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+# <mapml-map> Custom Element
+
+The <mapml-map> Custom Element is a [prototype](http://maps4html.github.io/MapML-Map-Custom-Element/) of core mapping functionality suitable for the Web.
+
+## Objective
+
+The objective of this web component is to demonstrate the feasibility of modifying / upgrading the <map> HTML element to support modern Web mapping requirements.  As such, it relies on the new Map Markup Language which delivers map information as hypertext.
+This element depends on the [MapML Leaflet Client javascript library](https://github.com/Maps4HTML/MapML-Leaflet-Client).
+
+## Maps4HTML Community Group
+
+MapML is being developed by the W3C [Maps For HTML Community Group](http://www.w3.org/community/maps4html/).  Membership in that group is encouraged, however you do not have to join to use the information found here.  However, if you wish to contribute, please join the Maps For HTML Community Group, and help us make the Web a map-friendly platform for everyone, everywhere!