add CLAUDE.local.md to gitignore (#3437)

Summary:

taking claude code for a more thorough spin, will start with local
instructions and will see what makes sense to upstream

Test Plan:

Reviewers:

Subscribers:

Tasks:

Tags:

Author: vkuzo

.gitignore

@@ -378,3 +378,6 @@ checkpoints/
 # Experimental
 torchao/experimental/cmake-out
 torchao/experimental/deps
+
+# local claude code files
+CLAUDE.local.md