[FEATURE] - create basic angular 2 front-end

[ortichon]

• create new public folder under client folder - will be our front-end directory

  this will be our server/hub front-end

• use existing express server to serve this folder

  put the express server in /client/app.js - later we'll move it to separate module

• read and install basic Angular-2 (TypeScript version) in public folder:

  AppComponent should be very simple - display hello, world! or somthing

we'll decide later how we want the branch-names conventions to be.
for now just use the issue format:

<issue_number><[FEATURE/BUG]><issue_header>
in this case:
2_[FEATURE]_create_basic_angular_2_front_end