README: mention getappenlight.com documentation

backend/README.md

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 AppEnlight
 -----------
 
 Performance, exception, and uptime monitoring for the Web
 
 ![AppEnlight image](https://raw.githubusercontent.com/AppEnlight/appenlight/gh-pages/static/appenlight.png)
 
 Automatic Installation
 ======================
 
 Use the ansible scripts in the `automation` repository to build complete instance of application
 You can also use `packer` files in `automation/packer` to create whole VM's for KVM and VMWare.
 
 Manual Installation
 ===================
 
 To run the app you need to have meet prerequsites:
 
 - python 3.5+ (currently 3.6 tested)
 - running elasticsearch (6.6.2 tested)
 - running postgresql (9.5+ required, tested 9.6 and 10.6)
 - running redis
 
 Install the app by performing
 
     pip install -r requirements.txt
     
     python setup.py develop
 
 Install the appenlight uptime plugin (`ae_uptime_ce` package from `appenlight-uptime-ce` repository).
 
 For production usage you can do:
 
     pip install appenlight
     pip install ae_uptime_ce
 
 
 After installing the application you need to perform following steps:
 
 1. (optional) generate production.ini (or use a copy of development.ini)
 
         appenlight-make-config production.ini
 
 2. Setup database structure:
 
        appenlight-migratedb -c FILENAME.ini
 
 3. To configure elasticsearch:
 
        appenlight-reindex-elasticsearch -t all -c FILENAME.ini
 
 4. Create base database objects 
 
    (run this command with help flag to see how to create administrator user)
 
        appenlight-initializedb -c FILENAME.ini
 
 5. Generate static assets
 
        appenlight-static -c FILENAME.ini
 
 Running application
 ===================
 
 To run the main app:
 
     pserve development.ini
 
 To run celery workers:
 
     celery worker -A appenlight.celery -Q "reports,logs,metrics,default" --ini FILENAME.ini
 
 To run celery beat:
 
     celery beat -A appenlight.celery --ini FILENAME.ini
 
 To run appenlight's uptime plugin:
 
     appenlight-uptime-monitor -c FILENAME.ini
 
 Real-time Notifications
 =======================
 
 You should also run the `channelstream websocket server for real-time notifications
 
     channelstream -i filename.ini
-    
+
+Additional documentation
+========================
+
+Visit  https://getappenlight.com for additional server and client documentation.
+
 Testing
 =======
 
 To run test suite:
 
     py.test appenlight/tests/tests.py --cov appenlight (this looks for testing.ini in repo root)
 
 
 Development
 ===========
 
 To develop appenlight frontend:
 
     cd frontend
     npm install
     grunt watch