Update README_CN.md

Update README.md

fix some typo in md files (#13)

chore(doc): user registration

fix(project): for releasing

fix(demo): quick start fix

feat(db): forbid data operation during traffic switching

feat(doc): add change log

feat(demo&doc): complete nacos demo

feat(demo): add badge for traffic

fix(doc): add doc for sc

fix(demo): spring beans

feat(demo): add demo page

feat(demo): split page for content

fix(demo): add image field