add cff sturcture and easy fill sections

citation.cff

@@ -0,0 +1,34 @@
+cff-version: 1.2.0
+message: "If you use this lesson material, please cite it using these metadata."
+authors:
+- name: "CodeRefinery"
+- family-names: "Bast"
+  given-names: "Radovan"
+- family-names: "Wikfeldt"
+  given-names: "Kjartan Thor"
+- family-names: "Rantaharju"
+  given-names: "Jarno"
+- family-names: "Darst"
+  given-names: "Richard"
+- family-names: "Wittke"
+  given-names: "Samantha"
+- family-names: "van der Burg"
+  given-names: "Sven"
+- family-names: "Razick"
+  given-names: "Sabry"
+- family-names: "Rasel"
+  given-names: "Annajiat Alim"
+- family-names: "Negru"
+  given-names: "Stefan"
+- family-names: "Lindi"
+  given-names: "Bjørn"
+- family-names: "van Vliet"
+  given-names: "Marijn"
+- family-names: "Orozco"
+  given-names: "Luisa"
+title: "CodeRefinery Documentation lesson"
+version: 1.0.0
+date-released: 2023-08-08
+url: "https://coderefinery.github.io/documentation/"
+license: CC-BY-4.0
+repository-code: "https://github.com/coderefinery/documentation"