reorganise README and add the text of the license compatibility from the .singularityci submodule

3 jobs for rmsingu in 2 minutes and 31 seconds (queued for 1 second)
Status Job ID Name Coverage
  Install
passed #430129
install_project

00:01:52

 
  Test
passed #430131
test_docker_registry

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passed #430130
test_project

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