set up environment.

## Code Development
- language/library/framework documentation in Dash. (additional [Dash-User-Contributions](https://kapeli.com/feeds/zzz/user_contributed/build/index.json), replace `index.json` with **key** name and **archive** name)
- config related [IDEA](https://www.jetbrains.com/idea/) plugins and settings. (eg: add `react.d.ts` as library, ESLint and change CodeStyle to auto format, `^+R` shortcut of running application)
- use `F12` open iTerm2 in top of screen rather than the terminal in IDEA.
## Infrastructure
- @GitHub as remote codebase. (1st step: add README.md in local)
- [travis-ci](https://travis-ci.org) for continue integration. (run linter, test...)
- auto deploy to AWS if required.