Update README.md

Tell more about `.env` convention

README.md

@@ -25,7 +25,7 @@ bun i
 
 - Adjust environment variables
 
-Create an `.env` file at the root and add the following environment variables to it:
+Create an `.env` file at the root and add the `SEASON_X_ID` and `SEASON_X_SECRET` (where X is the season number) environment variables to it:
 
 ```.env
 # ID of the mappack (Can be found on mappack page)
@@ -40,7 +40,6 @@ SEASON_3_SECRET=
 ```
 ![Secret API Key location](https://github.com/user-attachments/assets/23910d39-bcc6-4a80-8424-e265d06baefd)
 
-
 ## Usage
 
 After setting up, run the following command