Using Environment variables to access API key values

CredentialContext.cs

using System;

namespace MyAnimeListSharp.Auth
{
    public class CredentialContext : ICredentialContext
    {
        public string UserName { get; set; } =
            Environment.GetEnvironmentVariable("Project_MyAnimeList.UserName", EnvironmentVariableTarget.User);

        public string Password { get; set; } =
            Environment.GetEnvironmentVariable("Project_MyAnimeList.Password", EnvironmentVariableTarget.User);
    }
}