README first screen, CITATION.cff and SECURITY.md (#27)

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++cff-version: 1.2.0
++message: "If you use OpenVibe.Studio in research or a product, cite it as below."
++title: openvibe-studio
++type: software
++authors:
++  - name: OpenVibe
++    alias: OpenVibers
++    website: https://openvibe.network
++repository-code: https://github.com/OpenVibers/OpenVibe.Studio
++url: https://openvibe.studio
++license: MIT
++abstract: "Photo and Light, two open-source creative apps inside an OpenVibe account, at openvibe.studio."
++keywords:
++  - openvibe
++  - creative-tools
++  - image-editing
++  - photo-editor
++  - web
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  Photo and Light: two open-source creative apps served inside an OpenVibe account.
  
++**Live site:** https://openvibe.studio · **API docs:** https://openvibe.services · **For AI:** https://openvibe.studio/llms.txt
++**Run it:** `npm ci && npm run dev` (Node 22 or newer) · **Tests:** `npm test`
++
  - **Photo** is [PhotoCraft](https://github.com/storytold/photocraft), a layered photo editor.
  - **Light** is [LightCraft](https://github.com/storytold/lightcraft), a photo library and RAW developer.
  
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++# Security policy
++
++OpenVibe is run in the open, and we want to hear about security problems before anyone else does.
++
++## Reporting a vulnerability
++
++Email **[email protected]** with "security" in the subject. Please include what you found, where (URL,
++repository, file), how to reproduce it, and what an attacker could do with it. Do not open a public GitHub issue for
++a vulnerability, and do not test against other people's accounts, data or streams.
++
++We reply within 7 days, keep you updated while we fix it, and credit you when the fix ships if you would like.
++
++## Scope
++
++Every OpenVibe service and site (openvibe.live, openvibe.network, openvibe.tools, openvibe.media, openvibe.community,
++openvibe.games and the other openvibe.* domains) and every repository under github.com/OpenVibers. Machine-readable
++contact details are at `/.well-known/security.txt` on each site.
++
++## Supported versions
++
++Only the current `main` branch, which is what runs in production, receives fixes.