[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:  astrid_emde
     Type:  task         |      Status:  new
 Priority:  critical     |   Milestone:  Unplanned
Component:  OSGeoLive    |  Resolution:
 Keywords:               |
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Changes (by kalxas):

 * milestone:  OSGeoLive15.0 => Unplanned

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Ticket URL: <https://trac.osgeo.org/osgeolive/ticket/2179#comment:5>
OSGeoLive <https://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.