React Tutorial - 17.axios
1.split static template into components
2.add button on the function
a.deep destcture assignment and renane the property
b.use github search api to get data from remote server(url starts with api is the public api for developers to get data, cors error was handled in the back-end)
3.display the users' data
4.user-friendly
a.loading message
b.error message
c.initializing message