Left Navigation Exercise

#Usage:

1. git clone https://github.com/bindai/react-sample.git

2. npm install

3. webpack-dev-server

4. go to localhost:8080

#Time:

1. Learn react.js and set up react+webpack+babel environment => 1 hour.

2. Design UI, plan code, search and solve decomposed problems in advance => 4 hours.

3. Implementation => 4 hours.

   9 hours in total.

#Shortage:

1. Used online components to implement checkbox(material ui) and expand/collapse icon(react-icons). The size of related libs is a little bit large.

2. style codes should be concise and reusable.