Create CITATION.cff (#62)

CITATION.cff

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+cff-version: 1.2.0
+preferred-citation:
+  type: software
+  message: If you use this software, please cite it as below.
+  authors:
+  - family-names: Jocher
+    given-names: Glenn
+    orcid: "https://orcid.org/0000-0001-5950-6979"
+  - family-names: Chaurasia
+    given-names: Ayush
+    orcid: "https://orcid.org/0000-0002-7603-6750"
+  - family-name: Qiu
+    given-name: Jing
+    orcid: "https://orcid.org/0000-0003-3783-7069"
+  title: "YOLO by Ultralytics"
+  version: 8.0.0
+  # doi: 10.5281/zenodo.3908559  # TODO
+  date-released: 2023-1-10
+  license: GPL-3.0
+  url: "https://github.com/ultralytics/ultralytics"