let user know the rosh timer has been copied to clipboard in an elegant manner, needs styling

[cadenforrest]

Relevant code In Timer.js:

handleCopiedMessage(){
    this.setState({
      showCopiedMessage: true
    }); 
    setTimeout(()=>{
      this.setState({
        showCopiedMessage: false
      }); 
    }, 2000); 
  }
...
render(){
...
    let rosh = this.state.isOn ? (
      <div className={this.state.focused ? "focused" : ""}>
        {this.state.showCopiedMessage && <p>Copied to clipboard!</p>}
        <button
          onClick={() => this.handleRoshClick()}
          autoFocus
          ref={(c) => (this._input = c)}
        >
          {" "}
          Rosh died!{" "}
        </button>
      </div>
    ) : null;
}