Constant ENV_EXAMPLE 

Source
const ENV_EXAMPLE: &str = r#"# CELLSTATE Environment Variables
# Copy this to .env and fill in your values.
# Never commit .env to version control.

# API key from https://cellstate.batterypack.dev (or `cellstate start` for local dev)
CELLSTATE_API_KEY=cst_...

# API endpoint — defaults to local dev server
CELLSTATE_BASE_URL=http://localhost:3000
"#;