I need a leaderboard

I'm making a Sniper type game and I already have a score manager script:

 using UnityEngine;
 using System.Collections;
 
 public class ScoreManager : MonoBehaviour {
 
     public GUISkin skin;
     public int Score;
     public float BestDistance;
     private float lastestDistance;
     private float timeTemp = 0;
     private bool showdistance = false;
     private int scorePlus = 0;
     
     void Start () {
         Score = 0;
         BestDistance = 0;
     }
 
     void Update () {
         if(showdistance){
             if(Time.time >= timeTemp + 3){
                 showdistance = false;    
             }
         }
     }
     
     public void AddScore(int score,float distance){
         int bonus = 1;
         
         if(distance>500)
             bonus = 2;
         
         if(distance>1000)
             bonus = 5;
         
         if(distance>1500)
             bonus = 10;
         
         scorePlus = score * (((int)(distance * 0.1) + 1)) * bonus;
         Score += scorePlus;
         lastestDistance = distance;
         if(distance>BestDistance){
             BestDistance = distance;
         }
         
         showdistance = true;
         timeTemp = Time.time;
     }
     
     void OnGUI(){
         if(skin){
             GUI.skin = skin;
         }
         GUI.skin.label.fontSize = 35;
         GUI.skin.label.normal.textColor = Color.black;
         GUI.skin.label.alignment = TextAnchor.MiddleLeft;
         GUI.Label(new Rect(20,20,300,40),"SCORE "+Score);
         GUI.skin.label.fontSize = 20;
         GUI.Label(new Rect(20,60,300,40),"BEST "+Mathf.Floor(BestDistance)+" M.");
         
         if(showdistance){
             GUI.skin.label.fontSize = 35;
             GUI.skin.label.alignment = TextAnchor.MiddleCenter;
             GUI.Label(new Rect((Screen.width * 0.5f) - 150,(Screen.height*0.5f)-50,300,100),Mathf.Floor(lastestDistance)+" M.\n+"+scorePlus);
         }
     }
 }

but what i want is a leaderboard scene where the bests scores are shown. Some idea?