Adding Postgres and Redis documentation

Author: JBris

README.md

@@ -1 +1,44 @@
 # drupal-enterprise-stack
+
+* [PostgreSQL](#postgresql)  
+* [Redis](#redis)  
+
+
+## PostgreSQL <a name="postgresql"/>
+
+The Drupal stack uses Postgres as its database. 
+
+Database dumps can be imported and exported using `make dbimp` and `make dbexp` respectively.
+
+The following settings can be configured in your .env file:
+
+| Name        | Default Value           |  
+| ------------- |:-------------:|  
+| DB_NAME     | drupal | 
+| DB_USER    | user      |    
+| DB_PASSWORD | pass     |    
+| DB_ROOT_PASSWORD | password     |    
+| DB_HOST | postgres     |    
+| DB_PORT | 5432     |    
+| DB_CONTAINER_PORT | 5432     |    
+| DB_DRIVER | pgsql     |    
+
+
+## Redis <a name="redis"/>
+
+*Link:* https://www.drupal.org/project/redis
+
+The Drupal stack uses the PHPRedis as its PHP client. This extension should be installed during the Drupal image build process.
+
+Enable the Redis module. Visit localhost/admin/reports/redis to view the current status of the Redis module.
+
+Ensure that the following settings have been added to the settings.php file.
+
+```
+$settings['redis.connection']['interface'] = 'PhpRedis'; 
+$settings['redis.connection']['host'] = 'redis';  
+$settings['redis.connection']['port'] = '6379';  
+$settings['cache']['default'] = 'cache.backend.redis';
+$settings['queue_default'] = 'queue.redis_reliable';
+$settings['container_yamls'][] = 'modules/contrib/redis/example.services.yml';
+```