[DOC] Doc for CI test - Details about five level stucture and some other files. (#1167)

Signed-off-by: Alicia <115451386+congw729@users.noreply.github.com>
Co-authored-by: yenuo26 <410167048@qq.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -12,8 +12,8 @@ PLEASE FILL IN THE PR DESCRIPTION HERE ENSURING ALL CHECKLIST ITEMS (AT THE BOTT
 <summary> Essential Elements of an Effective PR Description Checklist </summary>
 
 - [ ] The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
-- [ ] The test plan, such as providing test command.
-- [ ] The test results, such as pasting the results comparison before and after, or e2e results
+- [ ] The test plan. Please providing the test scripts & test commands. Please state the reasons if your codes don't require additional test scripts. For test file guidelines, please check the [test style doc](https://docs.vllm.ai/projects/vllm-omni/en/latest/contributing/ci/tests_style/)
+- [ ] The test results. Please pasting the results comparison before and after, or e2e results.
 - [ ] (Optional) The necessary documentation update, such as updating `supported_models.md` and `examples` for a new model. **Please run `mkdocs serve` to sync the documentation editions to `./docs`.**
 - [ ] (Optional) Release notes update. If your change is user facing, please update the release notes draft.
 </details>