api-dev-requirements

Implement RestAPI server to allow you retrieve DVCH VN

## Database provided
  - Mongo DB
  
  mongodb+srv://user_ro:<password>@cluster0-b0cl8.gcp.mongodb.net/dvch?retryWrites=true&w=majority
  - password: o7vv7XCpbHwJxwVW
  
  This user is readonly user. it can't insert or update or delete any data from above database
  
  
  ## Database 
  - collection : items
  - data row are like this:
  
  ```
  {"_id":{"$oid":"5ea0ce3e00ab447fb07eb7c8"},"type":"Thành phố","code":1,"name":"Hà Nội"} -> level 1
  {"_id":{"$oid":"5ea0ce3e00ab447fb07eb7c9"},"type":"Quận","code":1,"name":"Ba Đình","parent_id":{"$oid":"5ea0ce3e00ab447fb07eb7c8"}} -> level 2
  
  {"_id":{"$oid":"5ea0ce3e00ab447fb07eb7ca"},"code":1,"name":"Phúc Xá","type":"Phường","parent_id":{"$oid":"5ea0ce3e00ab447fb07eb7c9"}} => level 3
  
  ```
  
  ## API Endpoint
  /api/v1/province
  return all the provinces , also has filter by type and name
  response
  ```
  [{ name: 'abc', type: 'type', code: 1}.....]
  
  ```
  - /api/v1/province/:name => return the province by name, list of all district it has
  - /api/v1/province/:name/district => return all district belong to that province if match (filter breturny parent_id)
  
  - /api/v1/district/?query="Txt" => return list of district that match with the query with case insensitive compare
  
  - /api/v1/district/:name => return district info witayh list of wards it has
  - api/v1/province/:provinName/district return all district belong to provine
  - a /api/v1/district/:name/wards => return list of wards
  -api/v1/ward/:id return ward id
  - api/v1/search?keyword=xx&page=1&pageSize=50 => return all item with  that match with search condition, with paging support, 
  
  ###
  use express
  write the code with unit test 
  deploy to heroku