added citation

CITATION.cff

@@ -0,0 +1,31 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+- family-names: "Schäfer"
+  given-names: "Richard A."
+  orcid: "https://orcid.org/0000-0001-9938-1920"
+- family-names: "Voß"
+  given-names: "Björn"
+  orcid: "https://orcid.org/0000-0002-5377-2800"
+title: "RNAnue"
+version: 0.1.0
+doi: 10.1093/nar/gkab340
+url: "https://github.com/Ibvt/RNAnue"
+preferred-citation:
+  type: article
+  authors:
+  - family-names: "Schäfer"
+    given-names: "Richard A."
+    orcid: "https://orcid.org/0000-0001-9938-1920"
+  - family-names: "Voß"
+    given-names: "Björn"
+    orcid: "https://orcid.org/0000-0002-5377-2800"
+  doi: "10.1093/nar/gkab340"
+  journal: "Nucleic Acids Research"
+  month: 9
+  start: 1 # First page number
+  end: 10 # Last page number
+  title: "RNAnue: efficient data analysis for RNA-RNA interactomics"
+  issue: 10
+  volume: 49
+  year: 2021