MAINT Adds .git-blame-ignore-revs (scikit-learn#20290)

Author: thomasjpfan

.git-blame-ignore-revs

@@ -0,0 +1,12 @@
+# Since git version 2.23, git-blame has a feature to ignore
+# certain commits.
+#
+# This file contains a list of commits that are not likely what
+# you are looking for in `git blame`. You can set this file as
+# a default ignore file for blame by running the following
+# command.
+#
+# $ git config blame.ignoreRevsFile .git-blame-ignore-revs
+
+# PR 18948: Migrate code style to Black
+82df48934eba1df9a1ed3be98aaace8eada59e6e