Amending REMP Mailer module documentation

README.md

@@ -1,5 +1,9 @@
 # CRM REMP Mailer Module
 
+REMP Mailer Module is an integration module connecting CRM with [REMP Mailer](https://github.com/remp2020/remp/tree/master/Mailer).
+
+Module adds listener for `NotificationEvent` to send emails, and attaches widgets to allow users/admins to configure newsletter subscriptions and to see logs of all sent emails in administration.
+
 ## Installing module
 
 We recommend using Composer for installation and update management.
@@ -30,4 +34,11 @@ remp_mailer:
     api_token: abcdef123456789
 ```
 
-If the configuration is incomplete, initialization will log an error to your configured logger and won't enable the module in CRM.
+If the configuration is incomplete, initialization will log an error to your configured logger and won't enable the module in CRM.
+
+When everything is ready, make sure you update CRM internal configuration by running following commands (they should always be part of your release process):
+
+```
+php bin/command.php api:generate_access
+php bin/command.php application:seed
+```