Move citation into .cff (#1622)

CITATION.cff

@@ -0,0 +1,18 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+  - family-names: Susmelj
+    given-names: Igor
+  - family-names: Heller
+    given-names: Matthias
+  - family-names: Wirth
+    given-names: Philipp
+  - family-names: Prescott
+    given-names: Jeremy
+  - family-names: Ebner
+    given-names: Malte
+  - name: "et al."
+title: "Lightly"
+type: software
+url: "https://github.com/lightly-ai/lightly"
+date-released: 2020

README.md

@@ -411,17 +411,4 @@ You can find out more about the company and it's services by following the links
 
 - [Homepage](https://www.lightly.ai)
 - [Web-App](https://app.lightly.ai)
-- [Lightly Solution Documentation (Lightly Worker & API)](https://docs.lightly.ai/)
-
-## BibTeX
-
-If you want to cite the framework feel free to use this:
-
-```bibtex
-@article{susmelj2020lightly,
-  title={Lightly},
-  author={Igor Susmelj and Matthias Heller and Philipp Wirth and Jeremy Prescott and Malte Ebner et al.},
-  journal={GitHub. Note: https://github.com/lightly-ai/lightly},
-  year={2020}
-}
-```
+- [Lightly Solution Documentation (Lightly Worker & API)](https://docs.lightly.ai/)