docs: Adds section on how to configure basic auth

README.md

@@ -23,6 +23,13 @@
    your Docker swarm box
 4. `abra app deploy YOURAPPDOMAIN`
 
+## Configuring basic auth
+
+1. Create the usersfile locally: `htpasswd -c usersfile <username>`
+2. Uncomment the Basic Auth section in your .env file
+3. Insert the secret: `abra app secret insert <domain> usersfile v1 -f usersfile
+4. Redploy you app: `abra app deploy -f <domain>`
+
 ## Configuring wildcard SSL using DNS
 
 Automatic certificate generation will Just Work™ for most recipes  which use a fixed