added cff file for Zenodo publishing

CITATION.cff

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+cff-version: 1.2.0
+title: NOMAD Simulations Schema Plugin
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - given-names: Nathan
+    family-names: Daelman
+    orcid: 'https://orcid.org/0000-0002-7647-1816'
+  - given-names: Bernadette
+    family-names: Mohr
+    orcid: 'https://orcid.org/0000-0003-0903-0073'
+  - given-names: José M.
+    family-names: Pizarro
+    orcid: 'https://orcid.org/0000-0002-6751-8192'
+  - given-names: Esma B.
+    family-names: Boydas
+    orcid: ''
+  - given-names: Joseph F.
+    family-names: Rudzinski
+    orcid: 'https://orcid.org/0000-0003-3403-640X'
+doi:
+repository-code: 'https://github.com/nomad-coe/nomad-simulations'
+url: 'https://nomad-coe.github.io/nomad-simulations/'
+abstract: >-
+  `nomad-simulations` is a plugin for the NOMAD software (https://zenodo.org/doi/10.5281/zenodo.8366162)
+  providing a common data schema for materials science simulations. This schema is utilized
+  within the many available standard parsers in order to convert the output of simulations
+  into a uniform, structured data format. The plugin is community-driven, and users are
+  encouraged to contribtue towards providing Findable, Accessible, Interoperable, and Reusable (FAIR) data.
+license: Apache-2.0