[OSGeoLive] #2179: add files for code of conduct and contributing on github

[OSGeoLive]

#2179: add files for code of conduct and contributing on github
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 Reporter:  astrid_emde  |      Owner:  osgeolive@…
     Type:  task         |     Status:  new
 Priority:  normal       |  Milestone:  OSGeoLive13.0
Component:  OSGeoLive    |   Keywords:
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 We are asked from the OSGeo Board to add two files to the github
 repositories
 * https://github.com/OSGeo/OSGeoLive-doc
 * https://github.com/OSGeo/OSGeoLive

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Ticket URL: <https://trac.osgeo.org/osgeolive/ticket/2179>
OSGeoLive <http://live.osgeo.org/>
self-contained bootable DVD, USB thumb drive or Virtual Machine based on Lubuntu, that allows you to try a wide variety of open source geospatial software without installing anything.