In C#, what and how to pass IServiceProvider in ErrorListProvider(IServiceProvider isp)?

I am creating a vsix project where I need to add some custom errors in Error List window. Now I am stuck in IServiceProvider. What it contains and why I need this and how I can get this? In my code, I need to initialize with a service provider. How can I do this? Following is code :

internal class ErrorListManager
{
    public static ErrorListProvider errorListProvider;

    public static void Initialize(IServiceProvider serviceProvider) 
    {
        errorListProvider = new ErrorListProvider(serviceProvider);

    }

    public static void AddError(string errorMsg) {
        AddTask(errorMsg, TaskErrorCategory.Error);
    }

    private static void AddTask(string errorMsg, TaskErrorCategory category)
    {
        errorListProvider.Tasks.Add(new ErrorTask
        {
            Category = TaskCategory.User,
            ErrorCategory = category,
            Text = errorMsg
        });
    }
}

Please help. I am a beginner for C# and VSIX. Thanks!