Return this after initialize so you can initialize it in 1 line

docs/guides/usage.md

@@ -10,3 +10,10 @@ ytmusic.initialize().then(() => {
 	// Use API here
 })
 ```
+
+In an async context, you can initialize the API in one line
+
+```ts
+const ytmusic = await new YTMusic().initalize()
+// Use API here
+```

src/YTMusic.ts

@@ -104,6 +104,8 @@ export default class YTMusic {
 				...config
 			}
 		}
+
+		return this
 	}
 
 	/**