Unity - Press F10 to Quit, or stop playing in the Editor.

F10ApplicationQuit.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class F10ApplicationQuit : MonoBehaviour {

	public KeyCode keyCode = KeyCode.F10;
	
	// Update is called once per frame
	void Update () {
		if(Input.GetKeyDown(keyCode))
        {
#if UNITY_EDITOR
			UnityEditor.EditorApplication.isPlaying = false;
#endif
			Application.Quit();
        }
	}
}