Run static function when unity game is loaded

OnLoadMethodAttribute.cs

// Create a non-MonoBehaviour class which displays
// messages when a game is loaded.
using UnityEngine;

class MyClass
{
    [RuntimeInitializeOnLoadMethod]
    static void OnRuntimeMethodLoad()
    {
        Debug.Log("After Scene is loaded and game is running");
    }

    [RuntimeInitializeOnLoadMethod]
    static void OnSecondRuntimeMethodLoad()
    {
        Debug.Log("SecondMethod After Scene is loaded and game is running.");
    }
}