The PR for a lightning talk application

[darkless456]

Note: there're issues for unit test, such as renderring react component.

Descriptions:

• how to bootstrap
  • npm run bootstrap to install dependencies of BE/FE
  • npm run start:dev:be to boot backend
  • npm run start:dev:fe to boot frontend
• user must signin before submitting a new talk or voting for a talk.
  • user/password: admin/123

[rankun203]

I think we have gathered enough information with the PR, thanks 👍