Update README.rst

Add:
- Link to schema 
- Link to preprint

Author: Aidajafarbigloo

README.rst

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 | SMECS facilitates the extraction of research software metadata from GitHub and GitLab repositories. It provides a user-friendly graphical interface for visualizing the retrieved metadata, enabling researchers and research software engineers to create high-quality metadata without reentering information already available elsewhere. The curated metadata is exported as CodeMeta-compliant JSON, ensuring integration with other tools and enhancing the discoverability, reuse, and impact of research software.
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+| 📄 For more details, see our `Preprint <http://doi.org/10.48550/arXiv.2507.18159>`_.
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 | **Authors:** Stephan Ferenz, Aida Jafarbigloo
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 Phases in SMECS
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 | The workflow of SMECS consists of four sequential phases: **Start**, **Extraction**, **Curation**, and **Export**.
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 .. image:: https://github.com/NFDI4Energy/SMECS/blob/master/docs/Extraction_via_hermes-1.png
    :alt: SMECS Workflow
    :width: 1000px
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 1. **Start Phase**
@@ -32,7 +29,7 @@ SMECS can operate without user-provided tokens for some repositories by using in
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 2. **Extraction Phase**
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-The Extraction phase uses `HERMES <https://github.com/softwarepub/hermes>`_ harvesting steps to retrieve metadata from multiple sources. For details on the specific metadata fields, see: `Metadata Terms in SMECS <https://github.com/NFDI4Energy/SMECS/blob/master/docs/metadata-terms.md>`_. Once the inputs from the Start phase are submitted, SMECS initiates metadata retrieval using four HERMES harvesters:
+The Extraction phase uses `HERMES <https://github.com/softwarepub/hermes>`_ harvesting steps to retrieve metadata from multiple sources. For details on the metadata fields, see: `Metadata Terms in SMECS <https://github.com/NFDI4Energy/SMECS/blob/master/static/schema/codemeta_schema.json>`_. Once the inputs from the Start phase are submitted, SMECS initiates metadata retrieval using four HERMES harvesters:
       - GitHub
       - GitLab
       - CFF (`Citation File Format <https://citation-file-format.github.io/>`_)