add fli, add func map(), add class with Router

[vlbychkov]

Added regular loop, Added map () function and Added React component class with Router, Route, NavLink, Switch

// fli 
for (let i = 0; i < object; i++) {

}

// arm
array.map((index, key) => {
  return <div key={key}></div>
})

// rcerr
import { BrowserRouter as Router, Route, NavLink, Switch } from 'react-router-dom'
import React, { Component } from 'react'
export class ReactComponent extends Component {
  render() {
    return (
      <Router>
        <NavLink to='/'></NavLink>
        <Switch>
          <Route to='/'/>
        </Switch>
      </Router>
    )

  }
}

export default ReactComponent;