add dynamodb persistence

Author: selimyanat

api/.env-dev

@@ -2,7 +2,7 @@ MACHINE_ID=1
 PORT=3000
 # Perhpas we should only use a domain name here instead of a full URL (with the port as it is error prone)
 SHORTENED_BASE_URL=http://localhost:3000
-# For testing purposes
+# You can set this property to false for rapid testing. It will use in-memory storage rather than pulling Redis and DynamoDB
 USE_PERSISTENT_STORAGE=false
 REDIS_URL=redis://localhost:6379
 # 10 minutes