- basic project structures settings
  - /routes
  - /schemas

- basic project structures setting
  - app.js
  - added mongoose

- updateCities.js
  - nosql collection for cityCode
  - used as foreign key between location and city

- updateSuburb.js
  - updating script for bus stops of 시외버스
  - each has cityCode mapping to cities from 'cities' collection of DB

- added public api documents
- updateExpress.js
  - update database based on separate xlsx file
- updateSuburb_test.js
  - test script to prevent from exhausting  all API call counts

- `schema/index.js`
  - changed the return value of function
  - so that we can safely do next job after connected
- added `scripts/clearLocations.js`
  - script to empty Location collection

- updateAir.js
  - similar to express bus
  - only 15 airports... added express.xlsx
- updateSuburb_test.js
  - test script for updateSuburb
  - only with 1 cityCode (11) for test purpose
- updateTrain.js
  - similar to suburb bus
- APIDOC.md
  - fixed consistancy in response props' format
  - camelCase
  - deleted `/routes/gps`, combined it with `/routes`

- deleted `routes/gps` routing

- scripts/updateSuburb.js done
- added test script for updateSuburb.js
- utility function
  - isArray: determines whether it's array or not

- updateMetroCities
  - script for only 2-digit cityCodes
  - used for train
- added metrocity schema
- update scripts
  - scripts/updateTrain.js
  - scripts/updateSuburb.js