Add readme, roadmap, documentation and contributing documents
Update roadmap, add semver note, add license note
Update composer.json
Add support section
Update semver note
Update maintainers and contributors note
Update license note
Add missing word
Add SensioLabsInsight badge
Use big KNPBUNDLES badge
Revert "SL fixes"

This reverts commit 5e9ab2dae0afa12db1ed9452f04f1904b407662b.
Add description for milestones in ROADMAP
Minor roadmap fixes