* docs: add submission grading steps to devcontainer README * add change --------- Co-authored-by: jingyuanlm <842442862@qq.com>
* chore: add devcontainer Dockerfile, devcontainer.json, and env * style: remove unnecessary comment on ENABLE_CACHE setting * docs: add internal devcontainer README with setup instructions * Update README in .devcontainer based on PR #997 --------- Co-authored-by: jingyuanlm <842442862@qq.com>