Add contribution and license infos to README
Add contribution and license infos to README

mcanevet/puppet-puppetserver,mmckinst/puppet-puppetserver,olivierHa/puppet-puppetserver,roman-mueller/puppet-puppetserver,olivierHa/puppet-puppetserver,roman-mueller/puppet-puppetserver,camptocamp/puppet-puppetserver,tdevelioglu/puppet-puppetserver,camptocamp/puppet-puppetserver