black: add page (#3506)

pages/common/black.md

@@ -0,0 +1,24 @@
+# black
+
+> A Python auto code formatter.
+> More information: <https://github.com/psf/black>.
+
+- Auto-format a file or entire directory:
+
+`black {{path/to/file_or_directory}}`
+
+- Format the code passed in as a string:
+
+`black -c {{path/to/file_or_directory}}`
+
+- Output a diff for each file on stdout:
+
+`black --diff {{path/to/file_or_directory}}`
+
+- Return the status without writing the files back:
+
+`black --check {{path/to/file_or_directory}}`
+
+- Auto-format a file or directory emitting exclusively error messages to stderr:
+
+`black --quiet {{path/to/file_or_directory}}`