Add citation file

Author: w1th0utnam3

CITATION.cff

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+cff-version: 1.2.0
+message: "If you use this software in your work, please consider citing it using these metadata."
+authors:
+- family-names: "Löschner"
+  given-names: Fabian
+  affiliation: "RWTH Aachen University"
+  orcid: "https://orcid.org/0000-0001-6818-2953"
+title: splashsurf
+abstract: "Splashsurf is a surface reconstruction tool and framework for reconstructing surfaces from particle data."
+version: 0.7.0
+# doi: 00.0000/zenodo.0000
+# date-released: 2000-00-00
+url: "https://github.com/w1th0utnam3/splashsurf"