Add CONTRIBUTING.md, CODE_OF_CONDUCT.md, CODE_STYLE.md, SECURITY.md.
Copy checkstyle config from qbit-webhooks. Switch LICENSE to AGPL v3.0
to match QRun-IO org standard. Update .gitignore to standard template.
Rewrite README following qbit-crm pattern with badges and full docs.
Set version to 0.1.0-SNAPSHOT for develop branch.