ft: added dotenv for .env file

src/main.rs

@@ -13,9 +13,11 @@ use crate::objects::materials::lambertian::{Lambertian, Metal};
 use crate::objects::sphere::Sphere;
 use crate::ray::Ray;
 use crate::vec3::Vec3;
+use dotenv::dotenv;
 use pretty_env_logger;
 
 fn main() {
+    dotenv().ok();
     pretty_env_logger::init();
 
     // setup objects