HelloWorld.cs

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class HelloWorld : MonoBehaviour {
    public GameObject block;
    public Text text;

	// Use this for initialization
	void Start () {
        text = GetComponent<Text>();
        GameObject spawn = Instantiate(block, new Vector3(0, 0, 0), Quaternion.Euler(0,0,-180.0f)) as GameObject;
        Debug.Log("Hello World");
        text.text = "Hello World";
	}



    // Update is called once per frame
    void Update () {
	
	}
}