Solved

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour {

    private Rigidbody rb;

    public int points;

    public float speed;

    void Start() {

        rb = GetComponent<Rigidbody> ();

    }

    void update (){
    add_force();
    }

    void FixedUpdate() {
        check_input();
    }


    void add_force(){
        Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
        rb.AddForce (movement * speed);
    }

    void check_input(){
        float moveHorizontal = Input.GetAxis ("Horizontal");
        float moveVertical = Input.GetAxis ("Vertical");
    }