REST API

https://api.bra.in/index.html 요약하여 설명해줘.

[Step 1: TheBrain 14 API 활용](brain://api.thebrain.com/7ecMvBstNUCIKdg0YM8QBg/OEoo8MXC1UirjoZmuxaU3w/Step1TheBrain14Api%ED%99%9C%EC%9A%A9

)