Add Posnic (posnic)

[sridharkalaibala]

Summary

Adds Posnic to the OSS Directory using the current v7 project schema.

Project identity

• Website: https://posnic.com
• GitHub organization: https://github.com/Posnic
• Primary open-source application: https://github.com/Posnic/POS
• License: AGPL-3.0-only
• Description: open-source, offline-first point-of-sale software for retail shops and restaurants

The posnic slug follows the directory's preferred dedicated-GitHub-organization naming pattern. The included PNG is Posnic's official application icon. This submission comes from an active administrator of the Posnic GitHub organization.

Validation

• project file passed the repository's current v7 schema parser
• staged files passed the repository's format:staged hook command via Corepack
• targeted Prettier check passed
• TypeScript check passed
• project slug, display name, and GitHub organization are unique in the current directory
• logo verified as the source-identical 256 x 256 PNG