Add an symfony:parameters:upload to handle interactive upload of parameters.yml
draft - add some doc
Set default value, add more information on README
fix default value schema
check if file is already shared
fix shared
Upload only shared file
check if linked_files is defined
check if linked_files is defined
Update README regarding parameters strategy
fix wording
Improve README
Prepare 0.3.0
Prepare 0.3.0