Khanh Cao - Gold List (Functions)

[r1nzl3rrr]

• List gold type, gold price
• Create API to update latest gold price, bid/ask price and bid/ask rate
• View gold price history

[r1nzl3rrr]

• Should Create all logic in the GoldService.
• Should set page size for gold price to 30 or more.

[r1nzl3rrr]

Merged branch, closing this issue now.