Add CODEOWNERS file with entry for docs directory (#25959)

## Summary & Motivation

Adds [CODEOWNERS
file](https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners)
with entry for docs directory so I am automatically added as a reviewer
to docs PRs.

## How I Tested These Changes

N/A

## Changelog

Adds CODEOWNERS file with entry for docs directory so @neverett is
automatically added as a reviewer to docs PRs.

---------

Signed-off-by: nikki everett <nikki@dagsterlabs.com>

.github/CODEOWNERS

@@ -0,0 +1,2 @@
+# Automatically request docs team for docs PR review
+/docs/              @neverett