Add CITATION.cff file

CHANGES.md

@@ -57,6 +57,8 @@
 
 ### Documentation
 
+- Add a CITATION.cff file to the root of the repository, containing metadata on how to cite this software (#3723)
+
 <!-- Major changes to documentation and policies. Small docs changes
      don't need a changelog entry. -->
 

CITATION.cff

@@ -0,0 +1,27 @@
+cff-version: 1.2.0
+title: 'Black: The uncompromising Python code formatter'
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - family-names: Langa
+    given-names: Łukasz
+  - name: "contributors to Black"
+repository-code: 'https://github.com/psf/black'
+url: 'https://black.readthedocs.io/en/stable/'
+abstract: >-
+  Black is the uncompromising Python code formatter. By
+  using it, you agree to cede control over minutiae of
+  hand-formatting. In return, Black gives you speed,
+  determinism, and freedom from pycodestyle nagging about
+  formatting. You will save time and mental energy for more
+  important matters.
+
+  Blackened code looks the same regardless of the project
+  you're reading. Formatting becomes transparent after a
+  while and you can focus on the content instead.
+
+  Black makes code review faster by producing the smallest
+  diffs possible.
+license: MIT