README updated to include ENVIRONMENT .env variable

Author: igorbenav

README.md

@@ -65,7 +65,7 @@
 - [ ] Add mongoDB support
 
 #### Security
-- [ ] FastAPI docs behind authentication and hidden based on the environment
+- [x] FastAPI docs behind authentication and hidden based on the environment
 
 #### Structure
 - [ ] Remove python-decouple in favor of starlette.config
@@ -206,6 +206,16 @@ TEST_USERNAME="testeruser"
 TEST_PASSWORD="Str1ng$t"
 ```
 
+And Finally the environment:
+```
+# ------------- environment -------------
+ENVIRONMENT="local"
+```
+`ENVIRONMENT` can be one of `local`, `staging` and `production`, defaults to local, and changes the behavior of api `docs` endpoints:
+- **local:** `/docs`, `/redoc` and `/openapi.json` available
+- **staging:** `/docs`, `/redoc` and `/openapi.json` available for superusers
+- **production:** `/docs`, `/redoc` and `/openapi.json` not available
+
 ### 3.2 Docker Compose (preferred)
 To do it using docker compose, ensure you have docker and docker compose installed, then:
 While in the base project directory (FastAPI-boilerplate here), run:
@@ -763,6 +773,9 @@ Should be changed to:
 command: gunicorn app.main:app -w 4 -k uvicorn.workers.UvicornWorker -b 0.0.0.0:8000
 ```
 
+> **Warning**
+> Do not forget to set the `ENVIRONMENT` in `.env` to `production` unless you want the API docs to be public.
+
 More on running it in production later.
 
 ## 7. Testing