write a config module

src/weather_portal.gleam

@@ -1,5 +1,17 @@
+import config
 import gleam/io
 
 pub fn main() -> Nil {
-  io.println("Hello from weather_portal!")
+  case config.load_config() {
+    Ok(cfg) -> {
+      io.println("Config loaded successfully!")
+      io.println("MQTT Host: " <> cfg.mqtt_host)
+      io.println("MQTT User: " <> cfg.mqtt_user)
+      io.println("MQTT PW: " <> cfg.mqtt_pw)
+      io.println("JWT Key: " <> cfg.jwt_key)
+    }
+    Error(err) -> {
+      io.println("Failed to load config: " <> err)
+    }
+  }
 }