Zipmex frontend code challenge

Our frontend dev was working on order form and order book features but our dev is on vacation.

Assuming you are new joiner and you are assigned to continue working on this task.

Before working on challenge

Please git checkout to a new branch
After finished the challenge, use git cmd
- git format-patch your-branch -o patches, Then zip patches folder to interviewer email.

What our dev have done

Simple order book UI to show orders
Simple order form UI that can add order buy or sell with price and amount to orderbook

What we expect

Orders in order book should be sorted by price, from high to low
Order book should show volume for each price
If users place order with the same price, those orders should be merged together. For example:
1. Buy price = 10, amount = 5
2. Buy price = 10, amount = 4
  
  Order book should show single entry with: Price = 10, amount = 9
Volume bar, showing order size relative to other orders in order book.
Market price
Allow user to submit order with decimal places with following validations:
- Price should be greater than 0
- Amount should be greater than 0
Some unit tests should be added
- e.g. utility function or UI that have condition

Bonus challenge:

Depth chart implementation. What is market depth? See here
Beautify Order book and order form
- Any design are welcome
- You can use any lib to style
Improve codebase
- Show us what you got !