Summary:
A sample .bazelrc files looks like:
```
build --disk_cache=.bazel-cache
build --show_progress --experimental_ui
build --announce_rc
build --verbose_failures
build --jobs=8
```

Test Plan: Make sure git ignores that file.

Reviewers: michelle, kgandhi

Reviewed By: michelle

Differential Revision: https://phab.corp.pixielabs.ai/D30

GitOrigin-RevId: 5d8f734ee76cabcf8a05d86fe3a174a76a7aeaa7