README.md should more detail.

[LeLuuTuong]

Hi,
Thanks for your projects, but please revise the "Download Real-Time Price Data via Node.js" section in the README.md file to be more detailed, as new users like me don't know how to run the command to achieve this.

Thank you.

[Leo4815162342]

@LeLuuTuong let me know what exactly you're struggling with, and I can try to document it in the best possible way