feat: init

config/app.rs

@@ -0,0 +1,8 @@
+use crate::config::AppConfig;
+use crate::error::AppResult;
+
+impl AppConfig {
+    pub fn app_url(&self) -> AppResult<String> {
+        self.get_env_or::<String>("APP_URL", "http://localhost:8000".into())
+    }
+}