README first screen and CITATION.cff (#750)

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++cff-version: 1.2.0
++message: "If you use OpenVibe.Live in research or a product, cite it as below."
++title: openvibe-live
++type: software
++authors:
++  - name: OpenVibe
++    alias: OpenVibers
++    website: https://openvibe.network
++repository-code: https://github.com/OpenVibers/OpenVibe.Live
++url: https://openvibe.live
++license: AGPL-3.0-only
++abstract: "Live streaming you run yourself: browser or OBS ingest, chat, clips, recordings and restream, at openvibe.live."
++keywords:
++  - openvibe
++  - nodejs
++  - self-hosted
++  - video
++  - chat
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  **Open source live streaming** — [openvibe.live](https://openvibe.live). Go live from a browser or OBS with no follower minimum: chat, clips, recordings, restream and The Rundown.
  
++**Live site:** https://openvibe.live · **API docs:** https://openvibe.services · **For AI:** https://openvibe.live/llms.txt
++**Run it:** `npm ci && npm run dev` (Node 18 or newer) · **Tests:** `npm test`
++
  Part of the [OpenVibe network](https://openvibe.network); [help](https://openvibe.help), [docs](https://openvibe.live/docs/architecture) and the [developer API](https://openvibe.services).
  
  ## Purpose