Add citation file

CITATION.cff

@@ -0,0 +1,34 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+- family-names: "Wick"
+  given-names: "Ryan R"
+  orcid: "https://orcid.org/0000-0001-8349-0778"
+title: "Trycycler"
+url: "https://github.com/rrwick/Trycycler"
+preferred-citation:
+  type: article
+  authors:
+  - family-names: "Wick"
+    given-names: "Ryan R"
+    orcid: "https://orcid.org/0000-0001-8349-0778"
+  - family-names: "Judd"
+    given-names: "Louise M"
+  - family-names: "Cerdeira"
+    given-names: "Louise T"
+  - family-names: "Hawkey"
+    given-names: "Jane"
+  - family-names: "Méric"
+    given-names: "Guillaume"
+  - family-names: "Vezina"
+    given-names: "Ben"
+  - family-names: "Wyres"
+    given-names: "Kelly L"
+  - family-names: "Holt"
+    given-names: "Kathryn E"
+  doi: "10.1186/s13059-021-02483-z"
+  journal: "Genome Biology"
+  month: 9
+  title: "Trycycler: consensus long-read assemblies for bacterial genomes"
+  volume: 22
+  year: 2021