README first screen and CITATION.cff (#269)

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++cff-version: 1.2.0
++message: "If you use OpenVibe.Tools in research or a product, cite it as below."
++title: openvibe-tools
++type: software
++authors:
++  - name: OpenVibe
++    alias: OpenVibers
++    website: https://openvibe.network
++repository-code: https://github.com/OpenVibers/OpenVibe.Tools
++url: https://openvibe.tools
++license: MIT
++abstract: "Free online tools for images, text, audio, docs, maps and video, open by API, at openvibe.tools."
++keywords:
++  - openvibe
++  - api
++  - audio
++  - image-tools
++  - online-tools
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  **Free online tools** — [openvibe.tools](https://openvibe.tools). Hundreds of tools that each do one job well (images, text, audio, docs, maps and video), open by API.
  
++**Live site:** https://openvibe.tools · **API docs:** https://openvibe.services · **For AI:** https://openvibe.tools/llms.txt
++**Run it:** `npm ci && npm run install:all && npm run start:gateway` (Node 22 or newer) · **Tests:** `npm test`
++
  Part of the [OpenVibe network](https://openvibe.network); [help](https://openvibe.help) and the [developer API](https://openvibe.services).
  
  ## Purpose