add info on IS_CLUSTER_ZERO (#256)

Co-authored-by: Derrick <[email protected]>

README.md

@@ -110,7 +110,7 @@ docker run -d --name k1-api-mongodb \
   mongo
 ```
 
-### Using Docker compose:
+### Using Docker compose
 
 ```bash
   docker compose up
@@ -120,6 +120,8 @@ docker run -d --name k1-api-mongodb \
 
 see [this .env example](./.env.example) for the necessary values
 
+Be sure to set `IS_CLUSTER_ZERO` to `true` if you want to run the API without having console running.
+
 ## Provider Support
 
 The following providers are available for use with the API.
@@ -283,4 +285,3 @@ go install github.com/swaggo/swag/cmd/swag@latest
 ```shell
 make updateswagger
 ```
-