Add citation

.github/workflows/cffconvert.yml

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+name: Validate CITATION.cff using cffconvert
+on:
+  push:
+    paths:
+      - CITATION.cff
+
+jobs:
+  validate:
+    name: "validate"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out a copy of the repository
+        uses: actions/checkout@v6
+
+      - name: Check whether the citation metadata from CITATION.cff is valid
+        uses: citation-file-format/[email protected]
+        with:
+          args: "--validate"

CITATION.cff

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+# This CITATION.cff file was generated with cffinit.
+# Visit https://bit.ly/cffinit to generate yours today!
+
+cff-version: 1.2.0
+title: Research Software Quality indicators
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - name: >-
+      European Virtual Institute for Research Software
+      Excellence
+    email: [email protected]
+    website: 'https://everse.software/'
+    alias: EVERSE
+identifiers:
+  - type: url
+    value: 'https://everse.software/indicators/website/indicators.html'
+repository-code: 'https://github.com/EVERSE-ResearchSoftware/indicators'
+keywords:
+  - Research Software
+  - Software Quality
+  - EVERSE
+  - EOSC
+  - Research Software Quality Indicators
+  - Research Software Quality Dimensions
+