Add company, license, ... fields to `manifest.json`

[VBPROGER]

Fields to be added:

Name	Description	Optional / Recommended Cross / Checkmark ❌ / ✔️
company	Owning company (optional).	❌
license	License (MIT, GNU GPL, etc) (recommended).	✔️
date	Creation date (recommended).	✔️
link	Link to project (optional).	❌
image	Base64-encoded image used as data (optional). URI	❌